I need balanced equations?

Question

HCl acidifies [ Zn(NH3)4]2+ and Na2Co3 is added to this. The precipitate is ZnCo3
and....
HNO3 acidifies Pb(OH)2 and Na2CO3 is added to this. This precipitates PbCO3

Answer 1

Tetrammine zinc (II) complex, [Zn(NH3)4]^+2, does react with HCl:

[ Zn(NH3)4]2+ (aq) + 4 HCl (aq) --> Zn+2 (aq) + 4 NH4Cl (aq)

Zn+2 (aq) + Na2CO3 (aq) --> ZnCO3 (s) + 2 Na+ (aq)

The second takes 2 steps:
2 HNO3 (aq) + Pb(OH)2 (s) ---> Pb(NO3)2 (aq) + 2 H2O (l)

Pb(NO3)2 (aq) + Na2CO3 (aq) ---> PbCO3 (s) +2 NaNO3 (aq)

Or overall:
2 HNO3 (aq) + Pb(OH)2 (s) + Na2CO3 (aq) ---> PbCO3 (s) + 2 NaNO3 (aq) + 2 H2O (l)

Answer 2

NH3 is ammonia and does not have a charge
NH4+ is ammonium ion, it does not combine with Zn, both positively charge
Please write carbonate as CO3-2, Co is cobalt

2HNO3 +Pb(OH)2 +Na2CO3 --->PbCO3(s) +2NaNO3 +2H2O

Answer 3

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