AQA Jun 2011 Paper 4 Q1

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section a answer all questions in the spaces provided do not write outside the box titration curves labelled a b c and d for combinations of different aqueous solutions of acids and bases are shown below all solutions have a concentration of mol dm ph ph volume cm volume cm ph ph volume cm volume cm a in this part of the question write the appropriate letter in each box from the curves a b c and d choose the curve produced by the addition of ammonia to cm of hydrochloric acid sodium hydroxide to cm of ethanoic acid nitric acid to cm of potassium hydroxide marks wmp jun chem do not write outside the box b a table of acid base indicators is shown below the ph ranges over which the indicators change colour and their colours in acid and alkali are also shown indicator trapaeolin bromocresol green cresol purple alizarin yellow ph range colour in acid colour in alkali red yellow yellow yellow yellow blue purple orange b i select from the table an indicator that could be used in the titration that produces curve b but not in the titration that produces curve a mark b ii give the colour change at the end point of the titration that produces curve d when cresol purple is used as the indicator mark turn over for the next question turn over wmp jun chem

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