(A) Copper(II) ion forms both an insoluble hydroxide and the complex ion [Cu(NH₃)₄]²⁺. Write equations to represent the expected reaction when 

(a) CuSO₄(aq) and NaOH(aq) are mixed; 

(b) An excess of NH₃(aq) is added to the product of part (a); and 

(c) An excess of HNO₃(aq) is added to the product of part (b).

(B) Zinc(II) ion forms both an insoluble hydroxide and the complex ions [Zn(OH)₄]^2- and [Zn(NH₃)₄]²⁺ Write four equations to represent the reactions of 

(a) NH₃(aq) with ZnSO₄(aq), followed by 

(b) Enough HNO₃(aq) to make the product of part (a) acidic; 

(c) Enough NaOH(aq) to make the product of part (b) slightly basic; 

(d) Enough NaOH(aq) to make the product of part (c) strongly basic.