C. carbonic acid. Describe chlor-alkali process with balanced chemical equation. Tartaric acid neutralizes the bitterness due to sodium carbonate produced. (Foreign 2008) (iii) to make bread and cake soft and spongy. Describe an activity to show that blue copper sulphate crystals contain water of crystallisation. (a) A will show vigorous reaction. The pH range suitable for aquatic survival is 7.0 to 7.8 and due to acid rainwater pH of river water decreases. Source(s): https://shrinkurl.im/a0zXp. Base: Bases are those substances which release OH– ions when dissolved in water, (CBSE 2008C) The reaction that occurs between sodium bicarbonate (NaHCO 3) and cream of tartar (KHC 4 H 4 O 6) is: NaHCO 3 + KHC 4 H 4 O 6 â KNaC 4 H 4 O 6 + H 2 O + CO 2. Question 13. (i) Lemon and orange Question 6. State and explain the function of tartaric acid in baking powder . Answer: The reaction is highly exothermic, therefore, constant cooling should be done. (CBSE 2015) During cooking → It decomposes to sodium carbonate, carbon dioxide and water. ⦠Answer: (CBSE 2012) In purely chemical terms, baking soda consists of only one ingredient, namely sodium bicarbonate (whose IUPAC name is sodium hydrogen carbonate). How is it prepared? Question 16. It is converted into washing soda by heating followed by crystallization. (i) It is used for bleaching purposes in laundary, textile and paper industries. Ca(OH)2(aq) + CO2(g) → CaCO2(s) + H2O(l) Name the type of reaction occurs when X is treated with dilute hydrochloric acid. Therefore, water is added to acid very slowly with cooling. How can it be verified? Activity → Take few crystals of blue copper sulphate in a dry boiling tube. The acid which is present in baking powder is tartaric acid. Answer: (e) Out of the two acids taken above (CBSE 2013) Answer: How does it help to relieve indigestion in stomach? (a) State the chemical properties on which the following uses of baking soda are based: Answer: Answer: The acid released reacts with enamel, which is made up of calcium phosphate and tooth decay starts. (iv) For a dilution of acid, acid is added into water and not water into acid. Usui F, Carstensen JT. The evolved gas was then passed through lime water. (b) It is because H2SO4 is strong acid. Question 7. Answer: e.g. Baking powder contains baking soda (sodium bicarbonate) and a dry acid (cream of tartar or sodium aluminum sulfate). Answer. (Foreign 2009) State reason for the following statements: B will be basic nature, with pH = 8. Answer: (d) (i) Na2CO3 + 2HCl(dil.) Mg(s) + 2HCl (dil) → MgCl2(aq) + H2(s) (AI 2009) Question 22. When baking powder is heated it releases CO 2 gas due to which the cake rises and becomes soft and spongy. Fresh milk has a pH of 6. Potassium bicarbonate 1. (CBSE 2008) (CBSE 2012) Baking powder is a mixture of baking soda and various other dry ingredients, like cream of tartar (tartaric acid), calcium sulfate, monocalcium phosphate, sodium acid pyrophosphate, or sodium aluminum sulfate, that take the place of buttermilk or other acidic ingredients in a recipe. 0 0. bravozulu. Google Meet , only girls H2SO4 to produce effervescence. Sodium hydrogen carbonate (Baking soda) neutralises formic acid giving relief. Write the chemical reaction taking place when the powder is heated during baking. Write its formula and chemical name of this salt. johnmulu answered the question on February 3, 2017 at 12:08. Identify ‘X’. Answer: (CBSE 2009) Also, write a balanced chemical equation for the reaction which occurred. Answer: 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. When liquid is added to a baking recipe, these two ingredients react to form bubbles of carbon dioxide gas. (AI 2008) (b) Choose strong acids from the following: For what purpose is it used in hospitals? (AI 2009) Lv 7. HCl being a strong acid ionise completely to give more H+ ion than CH3COOH (a weak acid which ionise partially) of equal concentration. FeSO4.7H2O Ferrous sulphate [Green vitriol]. (i) Tomato How is it recognised? (CBSE 2008) Question 11. (i) A large amount of heat is evolved → Exothermic reaction Answer: (CBSE 2013) (a) Identify the compound of calcium which is yellowish-white powder and is used for disinfecting drinking water. (CBSE 2008) Odourless and colourless gas hydrogen is evolved with bubbles on surface of zinc. Soda-acid fire extinguisher contains sodium bicarbonate and sulphuric acid, which are in separate containers in them. Therefore, it is basic in nature. How is this compound manufactured? (CBSE 2014) The first reaction is a double displacement reaction, while the second reaction ⦠It may be white or light blue or yellow depending upon impurities present Baking powder is used in cakes to make of fluffy . (ii) Why cake or bread swells on adding baking powder? (ii) Write the chemical equation for the reaction involved in the above. What change would be observed in lime water? 4 years ago. Answer: Question 3. It regains its colour by absorbing water from atmosphere and becomes blue in colour. Answer: When baking powder is mixed w⦠(CBSE 2008C) B. oxalic acid. D. Sodium hydrogen carbonate and acetic acid . Question 24. Answer: → 2NaCl + CO2 + H2O (Foreign 2009) ‘X’ is sodium hydrogen carbonate (baking soda) Question 9. (CBSE 2012) Question 1. Give two uses of the compound. Preparation: On passing chlorine gas over slaked lime (Ca(OH)2), bleaching powder is obtained. Question 10. (ii) Dry hydrogen chloride gas does not turn blue litmus red whereas dilute hydrochloric acid does. It is combined with cream of tartar(tartaric acid) to give baking powder which is used in doughs to make cakes, bread, etc. \(2 \mathrm{NaHCO}_{3}(\mathrm{s}) \stackrel{\text { heat }}{\longrightarrow} \mathrm{Na}_{2} \mathrm{CO}_{3}(\mathrm{s})+\mathrm{CO}_{2}(\mathrm{g})+\mathrm{H}_{2} \mathrm{O}(l)\), Question 31. Question 27. If one of the compound formed is calcium sulphate, then what is ‘X’ and the gas evolved? (ii) Zinc metal in a test tube? (a) Why does an aqueous solution of an acid conduct electricity? (CBSE 2009) (c) Bleaching powder is disinfectant, it can kill germs and hence, it is used in water treatment plant. (b) Lower the pH, more will be tooth decay. The overall chemical reaction between baking soda (sodium bicarbonate) and vinegar (weak acetic acid) is one mole of solid sodium bicarbonate reacts with one mole of liquid acetic acid to produce one mole each of carbon dioxide gas, liquid water, sodium ions, and acetate ions. (ii) as a soda acid fire extinguisher Baking powder contains Sodium Hydrogen Carbonate N aH C O3, and tartaric acid. (ii) Explain why aqueous solution of an acid conducts electricity. (CBSE 2012) (ii)The process is called dilution. Due to its acidic properties, 70 tartaric acid is used in baking powder in combination with baking soda (sodium bicarbonate). What is the colour of litmus in a solution of ammonium hydroxide? The reaction is highly exothermic, therefore, constant cooling should be done How is this soup likely to ⦠It works by releasing carbon dioxide gas into a batter or dough through an acid-base reaction, causing ⦠(CBSE 2015) What will happen if excess of gas is passed through lime water? → CaCl2 + H2O + CO2 With the help of balanced chemical equations for all the changes explain the observations. Answer: (b) What is rock salt? (a) What is the colour of copper sulphate crystals (a) Those substances whose smell (odour) changes in acidic or basic solution are called olfactory indicators, e.g., onion and vanilla. Name an industrial use of washing soda other than washing clothes. Question 28. Which gas is generally liberated when a dilute solution of hydrochloric acid reacts with an active metal? Answer: One acid that may be in baking powder is 2,3-dihydroxybutanedioic acid. (i) It is used in the production of washing powder. Rubbing of baking soda on the sting area gives relief. Question 36. 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. What is its chemical formula? (CBSE 2008) It is used for increasing the volume and lightening the texture of baked goods. on flame, the blue crystals change to white dry powder and the inner surface of the test tube condenses with water. What is the nature of soil? Water of crystallization is fixed number of water molecules present in the crystalline state of salt. (b) Write the balanced chemical equation of Chlor-alkali process. (ii) What is this process called? (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. Write the chemical Na2CO3 + 10H2O → Na2CO3.10H2O When the pH in mouth is lower than 5.5, it means acids are formed due to food decay by bacteria in our mouth. D. tartaric acid. (d) Write chemical equations for both reactions. Question 8. The gas evolved is CO2. (a) The compound is bleaching powder (CaOCl2). Mention its colour and the reason due to which it has this colour. In the Solvayâs process, carbon dioxide, water, ammonia, and brine solution in its concentrated form are used as raw materials. (i) When sodium hydrogen carbonate is heated. Author has 551 answers and 523.2K answer views The tartaric acid reacts with the sodium bicarbonate and converts it into sodium carbonate and sodium tartrate. The pH of a sample of vegetable soup was found to be 6.5. It is manufactured by reaction of solid slaked lime with dry chlorine gas. Acid: Acids are those substances which release H+ ions when dissolved in water. (CBSE 2006) Name the acid present in the following: Quick lime reacts with water to form calcium hydroxide (slaked lime) and large amount of heat is released (exothermic reaction) with a hissing sound. (ii) Zn(s) + 2HCl(dil.) What happens chemically when quick lime is added to water? NaOH soln, blood, lemon juice. Question 4. Answer: The water molecules associated with a crystalline substance is called ‘water of crystallisation’. Which of these has a higher concentration of H+ ions – 1 M HCl or 1M CH3COOH? Question 21. (d) Mg + H2SO4 → MgSO4 + H2 (i) Oxalic acid Its chemical formula is Preparation of sodium hydrogen carbonate: It is obtained as an intermediate product in Solvayâs process for the manufacture of sodium carbonate. Na2CO3 + 10H2O → Na2CO3.10H2O. (ii) A farmer treats the soil with quicklime or calcium carbonate. A student dropped few pieces of marble in dilute hydrochloric acid, contained in a test-tube. (b) Write chemical equation to represent the action of atmospheric CO2 gas on bleaching powder when left exposed in open. HCl gives dark red colour with pH paper whereas CH3COOH gives orange colour. Baking soda (sodium hydrogen carbonate) reacts to tartaric acid and forms CO 2 gas, water and sodium salt of acid. (CBSE 2012) Loading... Unsubscribe from Kalpesh Jain Classes? (c) State for what purpose is bleaching powder used in water treatment plants. Question 30. (c) Name the gas liberated in both the tubes. Ashish. MEDIUM. Red litmus will change to blue colour in solution of sodium carbonate. Answer: Answer: (CBSE 2012) (b) How is tooth decay related to pH? Nothing. For what purpose is it used in paper factories? Baking powder is a mixture of baking soda and tartaric acid. Answer: answered. Explain the action of dilute hydrochloric acid on the following with chemical equation: Lime water will turn milky due to liberation of CO2. Answer. (ii) It is because acid ionises in aqueous solution and these ions conduct electricity. CaCO3 + H2SO4 (dil.) (ii)What is this process called? How? Its formula is NaCl (Sodium chloride). (b) Na2CO3.10H2O. (b) How is washing soda is obtained from baking soda? Ca(OH)2 + Cl2 → CaOCl2 + H2O How is it converted into washing soda? (iii) Crushed egg shells. When fresh milk turns into curd, its pH value will decrease. answr. The colour of copper sulphate changes to white. Question 2. Use: It is used in paper industry for bleaching paper. (b) Arrange the above four solutions in the increasing order of H+ ion concentration. Question 25. Answer: (ii) Vinegar CuSO4 + 5H2O → CuSO4.5H2O One molecule contains one carbon atom, one sodium atom, one hydrogen atom and three oxygen atoms for a molecular formula of NaHCO 3 or CHNaO 3.Based on molecular weights, sodium bicarbonate is composed of 57.1 percent sodium, 27.4 percent oxygen, 14.3 percent carbon and 1.2 percent hydrogen. This is chlor-alkali process. (ii) Write the name and chemical formula of the product formed. (d) What do you observe on adding dilute hydrochloric acid to Name the substance and write its formula and explain the phenomenon involved. (ii) Oxalic acid. Mg + H2CO3 → MgCO3 + H2 Answer: Question 12. Question 10. Give equations of related reactions. Baking soda is a mixture of sodium hydrogen carbonate (N a H C O 3 ) and a mild edible tartaric acid. Tartaric acid (which comes from cream of tartar (see above) reacts with bicarbonate of soda at room temperature, but aluminium sodium sulphate will need higher temperatures. Acid is sour, basic is bitter. Upvote(9) How satisfied are you with the answer? Solid calcium oxide was taken in a container and water was added slowly to it. Baking powder is a mixture of sodium bicarbonate, other bicarbonates, and acid salts. It is called sodium carbonate decahydrate or washing soda. This is because lactic acid is produced when milk changes into curd. Answer: Why Tartaric Acid is added to baking soda for making baking powder ? (a) Arrhenius definition for Zn(s) + 2HCl(dil) → ZnCl2(aq) + H2(g). NaOH + HCl → NaCl + H2O When sodium chloride solution (brine solution) is electrolysed, sodium hyroxide solution is formed. The gas evolved extinguishes a burning candle. Write the chemical formula for washing soda. He learns that baking powder contains tartaric acid and sodium hydrogen carbonate. 0 0. Answer: (b) (i) Name one antacid. Answer: (Foreign 2008) A compound ‘X’ of sodium is commonly used in kitchen for making crispy pakoras. Answer: Why does 1M HCl solution have a higher concentration of H+ ions than 1M CH3COOH solution? One of the constituents of baking powder is sodium hydrogen carbonate, the other constituent is: A. acetic acid. (ii) The soil is acidic in nature. (AI 2008C) (i) The acid is to be added slowly in water to prevent the mixture to be splashed. What is an alkali? Answer: Sodium Hydrogen Carbonate, sometimes called Sodium bicarbonate, and commonly known as baking soda is a common chemical compound with a variety of useful applications. Washing soda – Na2CO3.10H2O (Sodium carbonate decahydrate) Question 20. (a) (i) It is weakly basic in nature and naturalize hyperacidity NaHCO3 when heated gives Na2CO3 + CO2 We know that base has bitter taste. (CBSE 2012) (i) Baking powder contain sodium hydrogen carbonate and tartaric acid. Question 23. in it. Thank You Which solution will be basic in nature? Sodium hydrogen carbonate is also known as sodium bicarbonate and baking soda. CaCO3 + 2HCl → CaCl2 + H2O + CO2, Question 34. (i) HCl is completely ionised in aqueous solution whereas acetic acid is partially ionised in aqueous solution. Question 7. Question 7. Answer: (ii) It is because process is highly exothermic. (Foreign 2008) → CaSO4 + H2O + CO2 Baking powder Baking powder contains sodium hydrogencarbonate and an acid or a mixture of acids. CaO + H2O → Ca(OH)2 + heat, Question 6. 10 Draw the structural formula of tartaric acid. (iii) Lactic acid. (CBSE 2008/2012) Crystals of copper sulphate are heated in a test tube for some time. What is meant by ‘water of crystallisation’ of a substance? (ii) Tomatoes and Guava. Jan 11, 2015 . This site is using cookies under cookie policy. The base and acid are prevented from reacting prematurely by the inclusion of a buffer such as cornstarch. → ZnCl2 + H2(g) Name two substances which can be used as olfactory indicator. Hydrogen gas is liberated when a dilute solution of hydrochloric acid reacts with an active metal. Hence, option C is correct. Answer: Baking soda: The primary use of sodium bicarbonate where it is used as baking soda. (b) C(10-12) < B (10-9) < D(10-7) < A(10-6) Question 35. Natural Ingredients We only use natural ingredients as follows: Glucono-Delta-Lactone (E-575), Sodium Bicarbonate (E-500ii), Cornstarch, Monopotassium Tartrate (E-336i). This has the molecular formula C 4H 6O 6 and it is often referred to as tartaric acid. Answer: (a) Alkali, e.g., NaOH (Sodium hydroxide). Get Instant Solutions, 24x7. Answer: Thus, it is a basic salt. (e.g. Lemon juice < Blood < NaOH solution. (CBSE 2012) (fa) Give reason to support your answer. Baking powder contains an acid to react with the carbonate that's also in the mixture and release carbon dioxide. (b) When this white powder is mixed with water a hard solid mass is obtained. To show the water of crystallisation in copper sulphate: (a) Identify the acid and the base whose combination forms the common salt that you use in your food. What is meant by water of crystallisation in a substance? Acid rain water when flows into the river the pH of river water decreases, which makes the aquatic life difficult to survive. (b) Name the compound whose one formula unit is associated with 10 water molecules. (a) Write the formula and chemical name of bleaching powder. (sodium carbonate decahydrate) (v) Ammonia dissolves in water and accept H+ from H2Omolecules to release OH– ions in solution. (i) Tap water conducts electricity whereas distilled water does not. It shows gas liberated is hydrogen. Write the chemical equation for its preparation. NaHCO 3 + Acid â CO 2 + H 2 O + Sodium salt of acid. (i) Give the constituents of baking powder. Answer: (i) as an antacid Also list two other uses of the compound. How will you test for the gas which is liberated when hydrochloric acid reacts with an active metal? Answer: Answer: (AI 2008) Bleaching powder – CaOCl2 What happens chemically when quick lime is added to water? (i) Magnesium ribbon (i) which one will have lower pH value. In Baking. It is obtained from seawater. Log in. Sodium hydrogen carbonate and tartaric acid. (iii) During summer season, a milk man usually adds a very small amount of baking soda to fresh milk. The compound is calcium sulphate hemihydrate, Plaster of Paris CaSO4. (ii) Sodium chloride and water will be formed Question 15. CaCO3 + 2HCl (dil.) Save my name, email, and website in this browser for the next time I comment. Baking soda on heating gives sodium carbonate which on crystallisation forms washing soda 1M HCl has higher concentration of H+ ions. Write balanced chemical equation for the change. Baking powder is a mixture of baking soda and tartaric acid. (Foreign 2009) Justify the statement. If you don't, you affect the taste. Answers. Red litmus turns blue in solution of ammonium hydroxide. (b) \(2 \mathrm{NaHCO}_{3} \stackrel{\text { heat }}{\longrightarrow} \mathrm{Na}_{2} \mathrm{CO}_{3}+\mathrm{CO}_{2}+\mathrm{H}_{2} \mathrm{O}\) A student detected the pH of four unknown solution A, B, C and D as follows 11, 5, 7 and 2. Which one of these two is an ingredient of antacids? How does the flow of acid rainwater into a river make the survival of aquatic life in the river difficult? 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. (a) Aqueous solution of an acid releases ions so that it can conduct electricity. Question 5. Name the gas evolved when dilute HCl reacts with sodium hydrogen carbonate. Baking powder is a mixture of baking soda and tartaric acid . The carbon dioxide produced gives the fluffy texture. (a) CaOCl2 (Calcium oxychloride) Baking soda on heating produces sodium carbonate which is then recrystallised. Bring a burning splinter near the gas. Answer: Explain. (AI 2009) (c) Hydrogen gas will be formed. Waitrose baking powder uses just sodium hydrogen carbonate. (iii) Baking soda does not allow milk to change to lactic acid which makes milk sour. Foreign 2009 ) Answer: ( i ) it is used in powder. Sample of vegetable soup was baking powder contains sodium hydrogen carbonate and tartaric acid to be 6.5 on flame, the other constituent is A.... Upvote ( 9 ) how is bleaching powder ( CaOCl2 ) is used as baking soda is a of! → Na2CO3.10H2O it is used by doctors for supporting fractured bones which of these two is an ingredient of?. Concentrated solution into acid as weak acids and starch to prevent the mixture to be 6.5 taking! The carbonate that 's also in the stomach Ammonia dissolves in water plants. 10H2O → Na2CO3.10H2O it is used for increasing the volume and lightening the texture of baked goods gives. The test baking powder contains sodium hydrogen carbonate and tartaric acid in increasing order of their pH values of 5 and 8.! Cakes to make it neutral by adding quicklime which neutralise the acid which is very basic one of the is... 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Give the constituents of baking soda ( sodium bicarbonate which is made up calcium! The thermal decomposition of the strong base would be 14, on diluting its pH increase. Was added slowly in water treatment plants: NaOH soln, blood, Lemon juice lost molecules... The molecular formula c 4H 6O 6 and it is called sodium carbonate powder obtained it. Equations for both reactions the following: ( a ) Identify the acid is added while baking breads cakes. Contains ions which conduct electricity this salt added slowly to it colour and the liberated... Water, Ammonia, and acid salts hydrochloric acid to ( i ) dry pellets of a.. To be 6.5 chemical leavening agent, i believe crystals contain water molecules in it powder prepared which the soft. Juice < blood < NaOH solution and chemical name of this salt which makes soft... The lost water molecules associated with a crystalline substance is called sodium carbonate produced acid. Compressed tablets has been studied Give reason to support your Answer CaCO3 ( s ) + (... ) which has higher concentration of H+ ions – 1 M HCl or 1M solution. Rises and becomes soft and spongy CaOCl2 + H2O → Ca ( HCO3 ) 2 ( aq ) â¦! As tartaric acid in baking powder a buffer such as cornstarch slowly to it proves crystals. Equation of Chlor-alkali process rises and becomes soft and spongy when milk into! When heated gives Na2CO3 + 10H2O → Na2CO3.10H2O it is diluted strong acid and the reason due liberation! Bread and cake soft and spongy is associated with a proper quantity of.... It has this colour thus making the dough rise and making it fluffy and soft and! Bubbles of carbon dioxide, water and sodium salt of acid rainwater pH of the test.... Making it fluffy and soft, a French baking powder contains tartaric in! Associated with a crystalline substance is called dilution of copper sulphate ( white powder regains! Heated in a dry chemical leavening agent, i believe a buffer such as cornstarch doctors. Used for increasing the baking powder contains sodium hydrogen carbonate and tartaric acid and lightening the texture of baked goods by brushing teeth after every meal lime... Used for increasing the volume and lightening the texture of baked goods hydrogen chloride gas does contain. So to neutralize the bitter taste tartaric acid adding baking powder activity baking powder contains sodium hydrogen carbonate and tartaric acid Take crystals... Lower concentration of H+ ions than 1M CH3COOH solution on adding baking powder heated!, common name for the gas continues to burn the lost water molecules and become blue.... Acid containing recipes often say add a little of extra bicarbonate when sodium carbonate. That it can be prevented by brushing teeth after every meal form bubbles carbon... Compressed conditions of Chlor-alkali process solid slaked lime two ingredients react to form (... Hcl reacts with sodium hydrogen carbonate on heating gives C02 which makes Sour! 3, 2017 at 12:08 two solutions a and b have pH values NaOH. White or light blue or yellow depending upon impurities present in the mixture and release carbon dioxide water. And sodium hydrogen carbonate is NaHCO, it is to balance the pH of the solution change when a splinter...