a) i) State TWO general properties of bases. ii) Distinguish between a strong acid and a concentrated acid, giving one example of each. b) Copy and complete the table below for the following salts, stating the method of preparation most suitable for each salt and giving a reason for your choice. Salt | Method of Preparation | Reason ------------------------|-----------------------|------- Lead(II) sulphate | | Potassium nitrate | | Copper(II) sulphate | | c) i) Write the equation for the reaction that occurs when excess ammonia solution is added to copper(II) sulphate solution. ii) What observation would be made during this reaction? iii) Name the type of reaction that occurs when ammonia acts as a base according to the Brønsted-Lowry theory. d) A student tested four solutions X, W, Y and Z with litmus paper and a pH meter and recorded the following results: Solution | Red litmus | Blue litmus | pH ---------|------------|-------------|---- X | No change | Turns red | 2 W | No change | No change | 7 Y | Turns blue | No change | 11 Z | No change | Turns red | 5 i) Which solution is strongly acidic? Give a reason. ii) Which solution could be an aqueous solution of a weak acid? Give a reason. iii) Identify solution Y and W.