(a) (i)  Name three different methods for preparing salts.
     (ii) Give one example of a balanced equation for each of the methods named in (a)(i).
     (iii) State two uses of sodium trioxocarbonate (IV). 

(b) If you were given some impure copper, describe how you would
obtain a specimen of the pure metal by electrolysis. 

 

(c) Given that sodium chloride has a solubility of 36.3 at 30  and 39.0 at
100  and that of silver nitrate is 297.0 at 30  and 952.0 at 100.

 

(i) Calculate the percentage of each substance in the saturated solution at 100  that is deposited on cooling to 30

(ii) Deduce which of the two salts can be purified more efficiently by crystallization.