(a) Write balanced molecular equations for the following potential precipitation reactions. Indicate the states of reactants and products [(aq) or (s)].

(b) In those cases where a precipitate forms, write the net ionic equation. If there is no reaction, state "No reaction."

(i) MgCl2 (aq) + Hg2(NO3)2 (aq)

(ii) KOH (aq) + Mn(CH3CO2)2 (aq)

(iii) K2CO3 (aq) + Ni(NO3)2 (aq)

(iv) K2SO4 (aq) + Ni(NO3)2 (aq)