AQA Jun 2010 Paper 4 Q5

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do not write outside the box in this question give all values of ph to two decimal places calculating the ph of aqueous solutions can involve the use of equilibrium constants such as kw and ka kw is the ionic product of water the value of kw is mol dm at c a i write an expression for ph mark a ii write an expression for kw mark b i calculate the ph of pure water at c marks b ii suggest why this pure water is not acidic mark b iii calculate the ph of mol dm aqueous sodium hydroxide at c marks wmp jun chem do not write outside the box c calculate the ph of the solution formed when cm of mol dm aqueous sulfuric acid are added to cm of mol dm aqueous potassium hydroxide at c assume that the sulfuric acid is fully dissociated marks d i write an expression for the acid dissociation constant ka for ethanoic acid mark d ii the value of ka for ethanoic acid is mol dm at c calculate the ph of a mol dm aqueous solution of ethanoic acid at this temperature marks turn over wmp jun chem

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