1. CHEMISTRY DEPARTMENT WAID ACADEMY ACIDS

2. What is the pH of 50 cm 3 of a 1 x 10 -2 mol l -1 solution of hydrochloric acid? 1.-2 2.-1 3.1 4.2 20

3. Pure water has a pH of 7. Which of the following is true? 1.[H + (aq)] = 10 -7 mol l -1 and [OH - (aq)] = 0 mol l -1 2.[H + (aq)] = 10 -7 mol l -1 and [OH - (aq)] = 10 -7 mol l -1 3.[H + (aq)] = 0 mol l -1 and [OH - (aq)] = 10 -7 mol l -1 4.[H + (aq)] = 10 -1 mol l -1 and [OH - (aq)] = 10 -13 mol l -1 20

4. Which of the following is the best description of a 0.1 mol l -1 solution of nitric acid? 1.Dilute solution of a weak acid. 2.Dilute solution of a strong acid. 3.Concentrated solution of a weak acid. 4.Concentrated solution of a strong acid. 20

5. Which solution will react with magnesium? 1.Sodium chloride 2.Lithium chloride 3.Potassium chloride 4.Ammonium chloride 20

6. Which of the following is the same for equal volumes of solutions of sodium hydroxide and ammonia? The solutions have the same concentration - they are equimolar. 1.Moles of acid needed for complete reaction. 2.Mass of solute present. 3.Mass of solute present. 4.pH of solution 20

7. Which of the following dissolves in water to give an alkaline solution? 1.Sodium nitrate. 2.Potassium ethanoate. 3.Ammonium chloride. 4.Lithium sulphate. 20

8. A trout fishery owner added limestone to his loch to combat the effects of acid rain. He managed to raise the pH of the water in the loch from 4 to 6. This caused the concentration of the H + (aq) ion to 1.increase by a factor of 2. 2.increase by a factor of 100 3.decrease by a factor of 2 4.decrease by a factor of 100 20

9. A fully dissociated acid is progressively diluted by the addition of water. Which of the following would increase with increasing dilution? 1.The pH value. 2.The electrical conductivity. 3.The rate of reaction with chalk. 4.The volume of alkali it will neutralise. 20

10. A liquid has a pH value of 10. What is the concentration of H + (aq) ions present, in mol l -1 ? 1.1 x 10 -10. 2.1.0 3.10.0 4.1 x 10 10. 20

11. Which gas dissolves in water to form a solution of a weak acid? 1.Hydrogen chloride. 2.Nitrogen dioxide. 3.Ammonia. 4.Sulphur dioxide. 20