Edexcel Jun 2017 (IAL) Paper 4 Q4 (with explained solutions) |

Skip to content

Edexcel Jun 2017 (IAL) Paper 4 Q4

Answers available below

4 What is the pH of the following solutions? Use Kw = 1.001014 mol2 dm6 where necessary. (a) 0.2 mol dm3 nitric acid. A 0.7 B 0.2 C +0.2 D +0.7 (b) 0.200 mol dm3 barium hydroxide, Ba(OH)2. A 14.7 B 14.0 C 13.6 D 13.3 (c) A mixture of 10.0 cm3 of 1.00 mol dm3 hydrochloric acid and 20.0 cm3 of 1.00 mol dm3 sodium hydroxide. A 13.5 B 13.7 C 14.0 D 14.5 (d) A buffer solution prepared by mixing 20 cm3 of 0.10 mol dm3 methanoic acid and 10 cm3 of 0.10 mol dm3 sodium hydroxide, given that pKa = 3.8 for methanoic acid. A 4.1 B 3.8 C 3.5 D 3.3 (1) (1) (1) (1) (Total for Question 4 = 4 marks) 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 *P48385A0328* Turn over<br />

Show answer

Mark (1) Mark (1) Mark (1) Mark (1) Section A (multiple choice) Question Number 1 Answer 1. The only correct answer is C A is not correct because because the acid forms of 1 and 2 do not correspond to the base forms of 1 and 2 B is not correct because because the acid forms of 1 and 2 do not correspond to the base forms of 1 and 2 D is not correct because because the acid forms of 1 and 2 do not correspond to the base forms of 1 and 2 Question Number 2 Answer 2. The only correct answer is C A is not correct because it is acidic B is not correct because it is acidic D is not correct because it is acidic Question Number 3 Answer 3. The only correct answer is A B is not correct because the pH of the substances are not as accurately known C is not correct because the pH of the substances are not as accurately known D is not correct because two solutions ensure the meter is calibrated across a pH range Question Number 4(a) Answer 4(a). The only correct answer is D A is not correct because has an incorrect sign B is not correct because are incorrect values C is not correct because are incorrect values<br />
Question Number 4(b) Question Number 4(c) Question Number 4(d) Question Number 5(a) Answer 4(b). The only correct answer is C A is not correct because the value is incorrect B is not correct because the value is incorrect D is not correct because the value is incorrect Answer 4(c). The only correct answer is A B is not correct because the value is incorrect C is not correct because the value is incorrect D is not correct because the value is incorrect Answer 4(d). The only correct answer is B A is not correct because the value is incorrect C is not correct because the value is incorrect D is not correct because the value is incorrect Answer 5(a). The only correct answer is A B is not correct because raising the pressure increases the rate of a gas reaction C is not correct because there is no change to the equilibrium yield D is not correct because raising the pressure increases the rate of a gas reaction Mark (1) Mark (1) Mark (1) Mark (1)<br />

Question 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

About us | Need Help? | Feedback

Proudly powered by WordPress | Theme: Sydney by aThemes.