AQA Jun 2016 Paper 4 Q1

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section a answer all questions in the spaces provided do not write outside the box a nitric acid hno is a strong acid ethanoic acid ch cooh is a weak acid write an equation to show how ethanoic acid behaves as a weak acid in its reaction with water mark b when pure ethanoic acid reacts with pure nitric acid ethanoic acid acts as a base write an equation for this reaction mark c two beakers a and b each contain cm of mol dm nitric acid c i calculate the ph of the solution formed after cm of distilled water are added to beaker a give your answer to decimal places marks c ii calculate the ph of the solution formed after cm of mol dm aqueous sodium hydroxide are added to beaker b give your answer to decimal places marks wmp jun chem do not write outside the box d a third beaker c contains cm of mol dm ethanoic acid the acid dissociation constant ka for ethanoic acid has the value mol dm at c d i write an expression for ka for ethanoic acid and use it to calculate the ph of the ethanoic acid solution in beaker c show your working give your answer to decimal places marks ka calculation d ii aqueous sodium hydroxide is added to beaker c until the ph of the solution becomes name the salt formed in the reaction of ethanoic acid with sodium hydroxide mark d iii calculate the value of in the solution with the ph of salt ethanoic acid marks turn over wmp jun chem e explain why chloroethanoic acid is a stronger acid than ethanoic acid do not write outside the box marks f explain why data books do not usually contain values of ka for strong acids marks wmp jun chem

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