Help!! Balancing Equations!!

[Flip415]

I need help!

I'm doing "balancing net ionic equations"

How do I do ?

1) MnCl₂ and HCI
2) MnCl₂ and Pb(NO₃)₂
3) NH₄I and Pb(NO₃)₂

[Simon]

I need help!

I'm doing "balancing net ionic equations"

How do I do ?

1) MnCl₂ and HCI
2) MnCl₂ and Pb(NO₃)₂
3) NH₄I and Pb(NO₃)₂

I'll show how to balance net ionic equations using your example #3:

1) Write a balanced equation in the molecular form.

For NH₄I and Pb(NO₃)₂ reactants it will be:
2NH₄I + Pb(NO₃)₂ = PbI₂ + 2NH₄Cl

2) Write total ionic equation.
In order to do that replace all dissolved species with appropriate combination of ions as they exist in solution. Do not change precipitates, gases and other not dissociated molecules.

In the case of equation #3:
NH₄I -> NH₄⁺ + I^-
Pb(NO₃)₂ -> Pb²⁺ + 2NO₃^-
NH₄Cl -> NH₄⁺ + Cl^-
do not change PbI₂ since it is precipitate

So far we have total ionic equation:
2NH₄⁺ + 2I^- + Pb²⁺ + 2NO₃^- = PbI₂ + 2NH₄⁺ +2NO₃^-

3) Write net ionic equation by removing all ions common for both sides of the reaction from the total ionic equation.

Removing NH₄⁺ and NO₃^-. What is left is the net ionic equation:
2I^- + Pb²⁺ = PbI₂

Good luck with your homework.