(a)(i) State three methods of preparing salts, giving one example in each case of a salt so prepared.

(ii) What type of salt is each of the following? NaH\(_2\)PO\(_4\); (CH\(_3\)COO)\(_2\)Pb; KAI(SO\(_4\))\(_2\). 12H\(_2\)O.

 

(b)(i) Write an equation for the reaction between dilute HCI and a solution of AgNO\(_3\).

(ii) Explain why NaNO\(_3\) is preferred to AgNO\(_3\) in the preparation of oxygen by thermal decomposition of trioxonitrate (V) salts.

(iii) When silver wire was dipped into an aqueous solution of CuSO\(_4\), the wire remained intact but when the wire was replaced with zinc rod, the rod decreased in size. Give an explanation for this observation.

 

(c) When a sample of a crystalline salt X was exposed to air, there was a loss in mass.

(i) What phenomenon was exhibited by X?

(ii) Suggest two substances which X could be.

(iii) On heating 5.00 g of a fresh sample of X to constant mass, 1.80g was lost in the form of water vapour. Calculate the number of molecules of water of crystallization in one molecule of X. [H = 1.00; O = 16.00; Anhydrous form of X = 160 g mol\(^{-1}\)