Edexcel Jun 2017 (IAL) Paper 4 Q2

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SECTION A Answer ALL the questions in this section. You should aim to spend no more than 20 minutes on this section. For each question, select one answer from A to D and put a cross in the box . and then mark your new answer If you change your mind, put a line through the box . with a cross 1 When ethanoic acid is mixed with water, what are the Brnsted-Lowry conjugate acid-base pairs? CH3COOH(aq) + H2O(l) (cid:85) H3O+(aq) + CH3COO(aq) acid 1 acid 1 acid 1 acid 2 + base 1 (cid:85)(cid:1)(cid:1) acid 2 + base 2 (cid:85)(cid:1)(cid:1) base 1 + base 2 (cid:85)(cid:1)(cid:1) acid 2 + base 2 (cid:85)(cid:1)(cid:1) base 1 base 2 acid 2 base 1 acid 1 2 Which of these substances gives a solution with the highest pH when equal amounts are added to the same volume of water? (Total for Question 1 = 1 mark) A CH 3COOH B CH 2ClCOOH C CH 3COONa D CH 3COCl 3 The calibration of a pH meter is best carried out using A solutions of an alkaline buffer and an acidic buffer. B solutions of a strong alkali and strong acid. C solutions of a weak acid and weak alkali. D deionised water. (Total for Question 2 = 1 mark) Use this space for any rough working. Anything you write in this space will gain no credit. (Total for Question 3 = 1 mark) *P48385A0228* D O N O T W R I T E I N T H I S A R E A D O N O T W R I T E I N T H I S A R E A D O N O T W R I T E I N T H I S A R E A<br />

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