(a) Battery acid' is typically composed of 30-50 % sulphuric acid in water. In order to determine the exact concentratio

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A Battery Acid Is Typically Composed Of 30 50 Sulphuric Acid In Water In Order To Determine The Exact Concentratio 1 (43.31 KiB) Viewed 56 times

(a) Battery acid' is typically composed of 30-50 % sulphuric acid in water. In order to determine the exact concentration of a solution of battery acid, a standard solution of sodium carbonate was prepared. 1.343 g of anhydrous sodium carbonate (Na2COs) was measured out and made up to 250 cm' with deionised water. 25 cm of the standard sodium carbonate solution was transferred quantitatively to a conical flask. S drops of methyl orange indicator was added to the flask. The sulphuric acid whose concentration was to be determined was added from a burette until the end point of the reaction was noted. The titration was repeated until consistent results were achieved. The average titre was 21.0 cm! () Write a chemical equation to describe the above reaction. (1 marks) (it) What is the purpose of the indicator? (1 marks) (ii) Calculate the concentration of the battery acid solution in mol. dm' and g dm (12 marks) (iv) Describe in detail how the standard solution of sodium carbonate was prepared and outline what glassware was necessary for the preparation. (2 marks) (1) Describe how the burette was prepared and what precautions should be taken when using this apparatus? (2 marks) (6) Write an equation to illustrate the reactions of cach of the following: (1) A strong di-protic acid with an alkali metal (ii) Astrong monoprotic acid with potassium hydroxide (iii) Sulphuric acid and calcium carbonate (6 marks) (e) Calculate the pH of the following solutions: A solution containing 1.575 g of nitric acid made up to 250 em' in deionised water. (ii) A solution containing 0.02g sodium hydroxide in 500 cm' water (II)A solution of O.IM solution of HCOOH given the ka - 1.7 x 104