Edexcel Jun 2017 Paper 4 Q7

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7 Ethanoic acid, CH3COOH, can react with methanoic acid, HCOOH. pKa of ethanoic acid = 4.8 pKa of methanoic acid = 3.8 Which is a correct conjugate pair in the reaction between ethanoic acid and methanoic acid? Acid HCOOH HCOOH CH3COOH CH3COOH Conjugate base HCOO + HCOOH2 CH3COO + CH3COOH2 8 What is the pH of water at 313 K? Kw = 2.921014 mol2 dm6 at 313 K 6.8 7.0 7.2 D 13.5 9 What is the pH of 0.1 mol dm3 propanoic acid at 298 K? Ka = 1.3105 mol dm3 at 298 K A 2.4 B 2.9 C 4.9 D 5.9 (Total for Question 7 = 1 mark) (Total for Question 8 = 1 mark) (Total for Question 9 = 1 mark) A E R A S I H T N I E T I R W T O N O D A E R A S I H T N I E T I R W T O N O D A E R A S I H T N I E T I R W T O N O D *P48082A0528* Turn over<br />

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