Whats the chemical equations and how do i balance them?

Question

Sodium Carbonate + Potassium Iodide → Sodium Iodide + Potassium Carbonate

Answer 1

The reaction is

Na2CO3 + KI = NaI + K2CO3

To balance, you must have the same number of elements on each side.

So, at the moment there are 2 potassiums on the right, but only 1 on the left. So we put a 2 in front of the KI.

This gives us

Na2CO3 + 2KI = NaI + K2CO3

Now there are 2 I's on the left, but only one on the right. So we put a 2 in front of NaI.

Na2CO3 + 2KI = 2NaI + K2CO3

There are 2 Na's on the left, and now 2 on the right because of the 2 in front of NaI. There are 2 potassiums on each side, two iodines and 1 CO3.

It is balanced.