Question

Balance the reactions which form ions. Choose "blank" if no other coefficient is needed. Writing the symbol implies "1."

Answer 1

The answers are the following:
1) (NH4)2CO3 2 NH4 +→ + CO3 -2
2) PbI2 →1 Pb+2 +2 I+1
3) (NH4)3PO4 →3NH4 + 3 + PO4 +

Answer 2

Following are the Balanced Reactions,

Reaction 1:

                            (NH₄)₂CO₃     →    2 NH₄⁺  +  CO3⁻²

Reaction 2:

                                     PbI₂    →    Pb⁺²  +  2 I⁻¹

Reaction 3:

                              (NH₂)₃PO₄     →     3 NH₄⁺  +   PO₄⁻³