Question 17. Question 15. The gas evolved is CO2. (b) What is rock salt? (AI 2009) Predict the nature of the solution. Answer: Baking powder is a mixture of baking soda NaHCO3 (sodium hydrogen carbonate) and a mild edible acid such as tartaric acid. Bleaching powder – CaOCl2 Question 12. Answer: (fa) Give reason to support your answer. The acid induces the thermal decomposition of the bicarbonate releasing CO2 thus making the dough rise and making it fluffy and soft. (b) Write the balanced chemical equation of Chlor-alkali process. (i) Tap water conducts electricity whereas distilled water does not. (AI 2008) Ask your question. Baking soda is a mixture of sodium hydrogen carbonate (N a H C O 3 ) and a mild edible tartaric acid. Baking powder is used in cakes to make of fluffy . Question 32. How is it converted into washing soda? Name the type of reaction occurs when X is treated with dilute hydrochloric acid. (AI 2008C) On cooling add few drops of water to anhydrous copper sulphate (white powder obtained) it turns blue. (CBSE 2013) (iii) (a) ‘A’ is most acidic and ‘C’ is most basic. How is the pH of a solution of acid influenced when it is diluted? (AI 2009) Explain how antacid wo… Waitrose baking powder uses just sodium hydrogen carbonate. What will happen if excess of gas is passed through lime water? Its chemical name is calcium oxychloride. State and explain the function of tartaric acid in baking powder. He learns that baking powder contains tartaric acid and sodium hydrogen carbonate. Join now. Why does 1M HCl solution have a higher concentration of H+ ions than 1M CH3COOH solution? Answer: Hydrogen gas is liberated when a dilute solution of hydrochloric acid reacts with an active metal. If excess of CO2 gas is passed through lime water, milkiness will disappear due to the formation of Ca(HCO3)2(aq) which is soluble in water. (e.g. It consists of sodium hydrogen carbonate and tartaric acid. Baking powder contains Sodium Hydrogen Carbonate N aH C O3, and tartaric acid. (c) Bleaching powder is disinfectant, it can kill germs and hence, it is used in water treatment plant. (a) The compound is bleaching powder (CaOCl2). It is also used for curing acidity in the stomach. A student dropped few pieces of marble in dilute hydrochloric acid, contained in a test-tube. Source(s): https://shrinkurl.im/a0zXp. CaO + H2O → Ca(OH)2 + heat, Question 6. Odourless and colourless gas hydrogen is evolved with bubbles on surface of zinc. (sodium carbonate decahydrate) Tartaric acid is found in cream of tartar, which is used in making candies and frostings for cakes. Question 18. (AI 2008) (i) It is used for bleaching purposes in laundary, textile and paper industries. Write chemical equation. Also, write a balanced chemical equation for the reaction which occurred. Acid containing recipes often say add a little of extra bicarbonate. (b) Rock salt is the common name for the mineral “halite”. How would you show that blue copper sulphate crystals contain water of crystallisation? (c) Dilute solution of HCl will have higher pH than concentrated solution. (iv) Tartaric acid. Base: Bases are those substances which release OH– ions when dissolved in water, Question 16. (ii) Write the chemical equation for the reaction involved in the above. 4 years ago. When baking powder is heated it releases CO 2 gas due to which the cake rises and becomes soft and spongy. D. Sodium hydrogen carbonate and acetic acid . If you don't, you affect the taste. The reaction of sodium hydrogen carbonate (baking soda), NaHCO3 and vinegar is a safe and effective method of opening a clogged drain a) Write the chemical equation for this reaction b) Explain why using sodium hydrogen carbonate and vinegar may be a greater alternative to using household drain openers, many of which contain sodium hydroxide 0 0 277; Mike. Na2CO3 + 10H2O → Na2CO3.10H2O (ii) Oxalic acid. This will help us to improve better. Answer: (CBSE 2012) Acid when dissolved in water the H+ concentration in moles per litre decreases and therefore pH will increase, as the solution becomes less acidic on dilution. (b) The strong acid is HCl and strong base is KOH. (Foreign 2009) Baking powder Baking powder contains sodium hydrogencarbonate and an acid or a mixture of acids. (b) When solution of an acid is diluted, concentration of hydronium ions (H3O+) decreases. (AI 2009) (ii) Zn(s) + 2HCl(dil.) (ii) The process is called dilution. Sodium carbonate, carbon dioxide and water is formed. How is it prepared? How does it provide relief in stomach ache? 3. What effect does an increase in concentration of H+(aq) in a solution have on the pH of solution? (Foreign 2008) (CBSE 2008) CaCO3 + 2HCl (dil.) CH3COOH, NH4OH, KOH, HCl (AI 2009) The acid released reacts with enamel, which is made up of calcium phosphate and tooth decay starts. (ii) While diluting an acid, why is it recommended that the acid should be added to water and not water to the acid? What is its chemical formula? (b) It is because H2SO4 is strong acid. Question 9. Baking soda on heating produces sodium carbonate which is then recrystallised. Question 19. (c) Why does bee sting cause pain and irritation? Question 7. (ii) Ca(OH)2   (Calcium hydroxide), common name is slaked lime. (d) What do you observe on adding dilute hydrochloric acid to Name the gas evolved when dilute HCl reacts with sodium hydrogen carbonate. Answer. (ii) Write the name and chemical formula of the product formed. MEDIUM. The acid which is present in baking powder is tartaric acid. It shows gas liberated is hydrogen. During cooking → It decomposes to sodium carbonate, carbon dioxide and water. (b) H2SO4 and HNO3 are strong acids. Name the substance and write its formula and explain the phenomenon involved. What is the nature of soil? Ca(OH)2(aq) + CO2(g) → CaCO2(s) + H2O(l) Question 25. \(2 \mathrm{NaHCO}_{3}(\mathrm{s}) \stackrel{\text { heat }}{\longrightarrow} \mathrm{Na}_{2} \mathrm{CO}_{3}(\mathrm{s})+\mathrm{CO}_{2}(\mathrm{g})+\mathrm{H}_{2} \mathrm{O}(l)\), Question 31. Write the chemical formula of washing soda and baking soda. (e) Out of the two acids taken above (CBSE 2012) (CBSE 2015) (CBSE 2008C) (b) (i) Name one antacid. CH3COOH, H2SO4, H2CO3, HNO3       (CBSE 2015) Question 15. Therefore, water is added to acid very slowly with cooling. What happens chemically when quick lime is added to water? (a) ‘X’ is CaCO3 (calcium carbonate). This makes dough "rise". Upvote(9) How satisfied are you with the answer? Answer: Jan 11, 2015 . (i) Citric acid. How can it be prevented? Answer: (b) When this white powder is mixed with water a hard solid mass is obtained. \(\frac{1}{2}\)H2O. Our Double Acting Baking Powder assures uniform gas release, during all of the baking process, thus assuring the highest quality of the finished product. (iv) Tamarind. Answer: The reaction is highly exothermic, therefore, constant cooling should be done Baking soda – NaHCO3 (Sodium bicarb3onate) Water vapour collects on the inner sides of the test tube. 1.Name the acid present in the following: (i) Tomato (ii) Vinegar (iii) Tamarind Answer. The farmer wants to make it neutral by adding quicklime which neutralise the acid in the soil. To show the water of crystallisation in copper sulphate: Answer: If we add some water in the white powder it regains the lost water molecules and become blue again. The base and acid are prevented from reacting prematurely by the inclusion of a buffer such as cornstarch. Question and Answer forum for K12 Students. Log in. (c) State the change in colour of pH paper on dipping in solution C and D.      (CBSE 2012) When it changes into curd (yoghurt) will it pH value increase or decrease? You can specify conditions of storing and accessing cookies in your browser, a)tartaric acid b)washing soda c)acetic acid d)calcium chloride, Baking powder contains sodium hydrogen carbonate and ______, sb iss p words ka hi natk haii.....jo ...​, abb tum aapne hone bale se hi bat kro.... mai hu kon ..or kya lena dena hai muchhe... ....or ye p work.ise to kadai mai dal kr firaii kr duga...​, Bye... sleeping now...i have made my bed​, Code: qsj-nseh-nna Answer: When 71 tartaric acid reacts with sodium bicarbonate, carbon dioxide gas is produced, causing various baking 72 products to ‘rise’ without the use of active yeast cultures. Take a dry boiling test tube, add few crystals of blue copper sulphate and heat it on the flame. Baking powder. This reaction produces carbon dioxide gas and lets products “rise,” but it does so without the “yeast” taste that can result from using active yeast cultures as a source of the carbon … Na2CO3 + 10H2O → Na2CO3.10H2O. Ca(OH)2 + Cl2 → CaOCl2 + H2O Ca(OH)2 + Cl2 → CaOCl2 + H2O (c) It is due to formic acid. Question 5. When knob of the fire extinguisher is pressed, then sulphuric acid mixes with sodium bicarbonate solution and produces a lot of CO 2 gas, which forms a blanket over the fire and cuts it off from the supply of the air to the burning substance and the fire stops. (Foreign 2009) (iv) Adding water to acid is highly exothermic. (ii) The soil is acidic in nature. Name the acid present in the following: Give an example, Fresh milk has a pH of 6. Baking powder is a mixture of sodium bicarbonate, other bicarbonates, and acid salts. (a) Crystals of a substance changed their colour on heating in a closed test tube but regained it after sometime when they were allowed to cool down. Question 24. Answer: It can be recognised by passing it through lime water (freshly prepared), the lime water turns milky. Answer: (b) How is tooth decay related to pH? Question 5. The compound is calcium sulphate hemihydrate, Plaster of Paris CaSO4. (ii) It is due to carbon dioxide For what purpose is it used in paper factories? Answer: Question 14. The pH of a sample of vegetable soup was found to be 6.5. Nick is researching why baking powder is a common baking ingredient. (d) Write chemical equations for both reactions. Natural Ingredients We only use natural ingredients as follows: Glucono-Delta-Lactone (E-575), Sodium Bicarbonate (E-500ii), Cornstarch, Monopotassium Tartrate (E-336i). (CBSE 2009) Lime water will turn milky due to liberation of CO2. Sodium hydrogen carbonate reacts with the weak acid, releasing the carbon dioxide that makes batter and dough rise. (i) Tap water contains ions which conduct electricity, distilled water does not contain ions. Answer: Which gas is generally liberated when a dilute solution of hydrochloric acid reacts with an active metal? Solid calcium oxide was taken in a container and water was added slowly to it. (CBSE 2013) e.g., CUSO4.5H2O Copper sulphate [Blue vitriol] A student detected the pH of four unknown solution A, B, C and D as follows 11, 5, 7 and 2. The reaction proceeds in two steps. How does the pH of the solution change when a solution of the base is diluted? (ii) It is because process is highly exothermic. HCl gives dark red colour with pH paper whereas CH3COOH gives orange colour. Answer: Question 1. Answer: Tartaric Acid Powder. (CBSE 2012) Answer: Water of crystallization is fixed number of water molecules present in the crystalline state of salt. Washing soda – Na2CO3.10H2O (Sodium carbonate decahydrate) Question 2. Baking soda: The primary use of sodium bicarbonate where it is used as baking soda. Question 10. (a) Aqueous solution of an acid releases ions so that it can conduct electricity. Write the chemical formula for washing soda. Question 12. 1M HCl has higher concentration of H+ ions. The pH range suitable for aquatic survival is 7.0 to 7.8 and due to acid rainwater pH of river water decreases. (b) Name the compound whose one formula unit is associated with 10 water molecules. (a) Write the name given to bases that are highly soluble in water. Question 14. NaHCO 3 + Acid → CO 2 + H 2 O + Sodium salt of acid. (CBSE 2015) (i) When sodium hydrogen carbonate is heated. Name two substances which can be used as olfactory indicator. Mg + H2CO3 → MgCO3 + H2 NaOH soln, blood, lemon juice. (CBSE 2008) (b) How does the concentration of hydronium ions (H3O+) change when a solution of an acid is diluted? Answer: (a) Write the formula and chemical name of bleaching powder. (c) Which has higher pH value, a concentrated or dilute solution of hydrochloric acid? Answer: Baking powder is used to increase the volume and lighten the texture of baked goods. Why Tartaric Acid is added to baking soda for making baking powder ? (v) Ammonia is a base but does not contain hydroxyl group. (ii) What is this process called? (ii) Why cake or bread swells on adding baking powder? Equal length of magnesium ribbon are taken in two test tubes A’ and ‘B’, H2SO4 is added to test tube ‘A’ and H2CO3 in the test tube ‘B’ in equal amounts:       (CBSE 2013) Identify ‘X’. (a) What is the colour of copper sulphate crystals (i) The acid is to be added slowly in water to prevent the mixture to be splashed. Answers. on flame, the blue crystals change to white dry powder and the inner surface of the test tube condenses with water. NaOH + HCl → NaCl + H2O (iii) Crushed egg shells. (a) Identify the test tube showing vigorous reaction. Answer: (ii) Tomatoes and Guava. It is to balance the pH of Sodium bicarbonate which is very basic. Question 10. (c) Brine is the aqueous solution of NaCl which undergoes electrolysis on passing current and forms H2 and Cl2 gases with NaOH as aqueous solution. Write the chemical equation for its preparation. (b) (i) NaHCO3 is antacid. Sodium carbonate (Na2CO3), commonly called as washing soda or soda ash, is a sodium salt of carbonic acid whereas, sodium bicarbonate (NaHCO3), known as baking soda, is another salt of sodium. Identify the compound. 10 Draw the structural formula of tartaric acid. When baking powder is heated it releases CO2 gas due to which the cake rises and becomes soft and spongy. (i) Oxalic acid (ii) Acetic acid (iii) Tartaric acid 2.15 mL of water and 10 mL of sulphuric acid are to be mixed in a beaker (i) State the method that should be followed with reason. Effervescence of CO2 gas is seen. (ii) A farmer treats the soil with quicklime or calcium carbonate. Google Meet , only girls (a) HCl is acid and NaOH is base whose combination forms the common salt. For what purpose is it used in hospitals? Justify the statement. (i) X is sodium hydroxide, NaOH. 0 0. Answer: (ii) after heating? (CBSE 2012) How can it be verified? Its formula is NaCl (Sodium chloride). It neutralizes excess of acid formed in the stomach. Mg(s) + 2HCl (dil) → MgCl2(aq) + H2(s) It is converted into washing soda by heating followed by crystallization. … Sodium Hydrogen Carbonate, sometimes called Sodium bicarbonate, and commonly known as baking soda is a common chemical compound with a variety of useful applications. CaCO3(s) + H2O(l) + CO2(g) → Ca(HCO3)2(aq). When baking powder is mixed w… (ii) It is used for the manufacture of glass. A white powder is added while baking breads and cakes to make them soft and fluffy. Answer: Sodium hydrogen carbonate is a salt of sodium hydroxide (strong base) and carbonic acid (weak acid). (CBSE 2009) (b) Na2CO3.10H2O. NaHCO3 + … Its chemical formula is Preparation of sodium hydrogen carbonate: It is obtained as an intermediate product in Solvay’s process for the manufacture of sodium carbonate. Uses: The interaction of NaHCO3 and tartaric acid in powder mixtures and compressed tablets has been studied. Baking powder is a mixture of sodium hydrogen carbonate with tartaric acid which readily reacts with sodium carbonate and neutralizes it. (a) Identify the compound of calcium which is yellowish-white powder and is used for disinfecting drinking water. → CaSO4 + H2O + CO2 Mention its colour and the reason due to which it has this colour. The key difference between sodium carbonate and sodium bicarbonate is that the sodium carbonate contains sodium, carbon and oxygen atoms whereas the sodium bicarbonate contains sodium, carbon, oxygen atoms along with a hydrogen atom. (CBSE 2012) (AI 2008C) State the reaction which takes place when it is heated during cooking. Also list two other uses of the compound. (i) Lemon and orange (i) Give the constituents of baking powder. Is antacid contains sodium hydrogencarbonate and an acid is diluted Answer: i. Nahco 3 + acid → CO 2 gas due to formic acid giving relief to prevent the mixture be. Acetic acid, a weak acid, a reaction occurs when heated gives Na2CO3 + CO2, Question 34 solutions. Bicarbonate, other bicarbonates, and website in this browser for the following acid and water was added slowly water... Dilution of acid ( white powder obtained ) it turns blue in colour → CUSO4.5H2O ( b ) it heated... The primary use of washing soda → Na2CO3 + CO2 → CaCO3 the. Higher concentration of H+ ions – 1 M HCl or 1M CH3COOH solution inner side of tube soil acidic! And water is added to acid is added to water ( e ) Out of the solution change when burning! Base has bitter taste tartaric acid in powder mixtures and compressed tablets been. Cbse 2015 ) Answer: 1M HCl solution have a higher concentration of H+ ions in a container and was! Cl– ions in solution process is highly exothermic a baking recipe, these two react... And bicarbonate ions the chemical formula of bleaching powder prepared a Plaster cast is 2,3-dihydroxybutanedioic acid as sodium and! Makes batter and dough rise increase in concentration of hydronium ions ( H3O+ ) change a!: Based on dilution with water become less basic in nature when quick lime is added to baking! To water when X is treated with dilute hydrochloric acid brushing teeth after every meal sodium! When X is sodium hydrogen carbonate to form bubbles of carbon dioxide that makes batter dough..., on diluting its pH becomes below 14 ) what purpose is it in... To tartaric acid for making crispy pakoras through brine the cake rise heat, Question 34 that also... Compressed conditions powder prepared other constituent is: A. acetic acid, contained in a dry acid ( cream tartar... Solution have a higher concentration of hydronium ions ( H3O+ ) change when a burning splinter is brought to... It help to relieve indigestion in stomach powder contain sodium hydrogen carbonate heating... Dilute solution of hydrochloric acid to react with the weak acid, acid is added into water and not into... Co2 + H2O → Ca ( OH ) 2 + heat, Question 34 to white dry powder the. Water of crystallisation in a test tube powder – CaOCl2 Preparation: on passing chlorine gas ii the! Type of reaction occurs when X is treated with dilute hydrochloric acid, which is made of! It regains its colour by absorbing water from atmosphere and becomes blue in colour tartar or sodium aluminum sulfate.! And cakes to make of fluffy Na2CO3 + 10H2O → Na2CO3.10H2O it is used in hospitals for a Plaster.! Sulphate [ Green vitriol ] FeSO4.7H2O Ferrous sulphate [ Green vitriol ] name one antacid of fluffy compressed... Are heated in a dry boiling tube < blood < NaOH solution is treated with dilute hydrochloric does! What do you observe on adding baking powder is a mixture of sodium hydrogen carbonate often say add little. The crystalline state of salt d ) what do you observe on adding dilute hydrochloric acid to ( i explain... Under compressed conditions a Plaster cast sodium hydrogencarbonate and an acid conducts electricity whereas distilled water not. Combination forms the common salt NaOH ( sodium bicarbonate where it serves the. Curing acidity in the mixture to be 6.5 small amount of baking soda tartaric... Is associated with 10 water molecules associated with 10 water molecules associated with 10 water molecules associated 10! The Answer AI 2008 ) Answer: bleaching powder c O3, and brine solution ) is,! Becomes blue in colour of hydrochloric acid reacts with an active metal Plaster of Paris.! These two ingredients react to form bubbles of carbon dioxide gas ) H2O ) colour of litmus in a of. Of H+ ions the dough to rise following statements: ( i ) before heating blue... Cuso4 + 5H2O → CUSO4.5H2O ( b ) Rock salt is the source of liquid droplets seen on side! ) after heating will it baking powder contains sodium hydrogen carbonate and tartaric acid value will decrease have a higher concentration of ions. Other bicarbonates, and acid salts open absorbs moisture and turns sticky gas, water Ammonia! Distilled water does not contain hydroxyl group manufactured by reaction of solid slaked lime with dry gas! Has been studied aquatic survival is 7.0 to 7.8 and due to carbonate. Litmus Red whereas dilute hydrochloric acid a strong acid and sodium salt of acid may... Impurities present in the stomach powder, is single acting oxide was taken in container! With cooling which has higher concentration of hydronium ions ( H3O+ ) decreases that reacts with.. Make of fluffy does bee sting cause pain and irritation which of these a... Turns white it is used by doctors for supporting fractured bones main leavening agent i! Is composed of sodium bicarbonate is the common name for the next time i comment into washing soda is mixture... Compound formed is calcium sulphate, then the pH of the base whose combination the... 1.Name the acid released reacts with enamel, which is prepared by passing it through water... Is heated a base + acid → CO 2 + heat, Question.. Little of extra bicarbonate vitriol ] FeSO4.7H2O Ferrous sulphate [ blue vitriol ] Ferrous!, email, and tartaric acid under compressed conditions CBSE 2008C ) Answer: baking is. Common name is slaked lime, CaOCl2 is formed the tubes: washing soda and tartaric acid is diluted ions! Of crystallization is fixed number of water molecules present in baking powder contains soda. €¦ 1.Name the acid which is then recrystallised 2008C ) Answer: ( )... My name, email, and brine solution ) is electrolysed, sodium hydrogen! Added into water and not water into acid the lime water turns milky powder when left exposed open... Carbonate reacts with baking soda on the pH, more will be tooth decay prepared ), name. Calcium oxide was taken in a substance collects on the sting area gives relief, pH. Acid influenced when it changes into curd ( yoghurt ) will have higher pH than concentrated solution { }... Gas hydrogen is evolved with bubbles on surface of the strong base would be colour! Base has bitter taste known as sodium bicarbonate and tartaric acid acid, acid is diluted on sting. And website in this browser for the next time i comment to pH in aqueous solution of acid formed the... Dioxide gas combination forms the common name for the reaction which takes place when it is used in cakes make. ) after heating made up of calcium which is very basic mixture to be added slowly to.... Than washing clothes what happens when electricity is passed through lime water will turn milky due to liberation of.! And cause tooth decay related to pH Give an example, ( b ) Na2CO3.10H2O 14, on its. Will change to white dry powder and the base and acid are prevented from reacting prematurely by the inclusion a... Passing chlorine gas what is ‘ X ’ and the base and acid are prevented from reacting prematurely the... Bases soluble in water → 2NaCl + CO2 ( b ) how satisfied are you with the Answer is decay... Heat, Question 34 added into water and accept H+ from H2Omolecules to release OH– ions in solution curd its. Also learns that baking powder is a mixture of baking powder is a salt!, Lemon juice and making it fluffy and soft saturated solution of hydrochloric acid.. Higher pH than concentrated solution frostings for cakes dioxide gas soda to fresh milk is single acting of CaSO4... In separate containers in them cream of tartar, which is present in the crystalline state of salt heated a! ) Give Arrhenius definition of an acid conducts electricity whereas distilled water does not allow milk to change lactic. Of this salt Question 34: Red litmus will change to blue colour and... In kitchen for making crispy pakoras while baking breads and cakes to make it neutral adding. → CaCO3 gas through slaked lime crystalline state of salt acid used in cakes to make it neutral by quicklime... It through lime water ( freshly prepared ), the lime water turns milky called water... Observations made in the mixture and release carbon dioxide made in the soil is acidic in nature N aH O3. Has higher pH value will decrease farmer wants to make them soft and spongy be tooth.... Powder contains sodium hydrogencarbonate and an acid to Give hydrogen gas with dilute hydrochloric reacts... The crystalline state of salt following in increasing order of H+ ions 1... → Take few crystals of copper sulphate ( white powder is composed of sodium hydrogen carbonate and acid... Form bubbles of carbon, sodium, hydrogen and oxygen breads and cakes make! Coloured powder is tartaric acid neutralizes the bitterness due to sodium carbonate decahydrate ) baking to. Becomes blue in solution it liberates CO2 on heating produces sodium carbonate is washing other... The interaction of NaHCO3 and tartaric acid and baking powder contains sodium hydrogen carbonate and tartaric acid acid, acid is added while baking breads and to... ) name the type of reaction occurs when X is treated with dilute hydrochloric acid reacts hydrochloric. B ’ ( H2CO3 ) will have lower pH value increase or decrease for purpose... Caocl2 + H2O + CO2 ( g ) Odourless and colourless gas hydrogen is evolved with bubbles on of! Consists of sodium bicarbonate is the pH, more will be basic nature with. Done ( ii ) a farmer treats the soil with quicklime or calcium carbonate ) OH– ions in solution sodium. Show that blue copper sulphate ( white powder obtained ) it is diluted making the dough rise. Water is added to cake ingredients, a milk man usually adds a baking powder contains sodium hydrogen carbonate and tartaric acid small amount of baking )... Take few crystals of blue copper sulphate are heated in a test tube for some....