(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. 

A solution of a mineral acid containing 0.10 mol of the acid per dm of solution. B IS a solution Containing 1.325g of anhydrous sodium trioxocarbonate (IV) per dm of solution.

(a) Put A into the burette and titrate with 20cm\(^3\) or 25cm\(^3\) portions of B using methyl orange as an indicator. Record the volume of your pipette

(b) From your results and the information is given, calculate;

(i) The number of mole of acid in the average titre

(ii) The number of mole of sodium trioxocarbonate (IV) in the volume of B pipette,

(iii) The mole ratio of acid to base in the reaction [H = 1, C = 12, O = 16, Na 23]

(c) Suggest what the acid in (a) Could be giving reasons for your answer. Hence, write the equation for the reaction. 

Carry out the following exercises on sample C. Record your observations and identify any gases evolved. State the conclusion you draw from the result of each test.

(a) Put about half of sample C into a conical flask and add about 5cm\(^3\) of tetrachloroethane followed by 15cm\(^3\) of water. Shake vigorously for about one minute. Put the resulting mixture into a burette and allow to stand until two layers separate. Run the two layers into two separate conical flasks and label them accordingly.

(b) Using the following reagents only, bench sodium hydroxide solution, aqueous ammonia solution, aqueous lead (II) trioxonite (V) solution, silver trioxonitrate (V) solution. bench trioxonitrate (V) acid. Identify the ions present in the upper layer solution

(c) Add 2 - 3 drops of the lower layer solution to about 2cm\(^3\) of starch solution from your result, name the substances which dissolved in the upper and lower layers. 

Aqueous solutions of zinc chloride, calcium chloride iron (lII) tetraoxosulphate (VI) and lead (II) trioxonitrate (IV) are contained in four separate bottles whose labels have been lost. Using aqueous ammonia solution only, show how you would identify the content of each bottle.