(a) A mixture consist of sodium chloride, ammonium chloride and lead (II) tetraoxosulphate (VI). Describe how you would obtain each component in a pure state.

(b) You are required to determine the concentration of a solution of tetraoxosulphate (VI) acid by titrating it against sodium trioxocarbonate (IV) solution of known concentration.

(i) Name the indicator you would use 

(ii) List two precautions you would take to ensure accurate readins

(iii) State the colour of the sodium trioxocarbonate (IV) solution after adding the named indicator and then at the end point.