Write the balanced net ionic equation for the following chemical reaction: A solution of sodium dichromate, Na2Cr2O7, is added to an acidic solution containing Fe2+ ions.

Answer 1

The two balanced half equations are as follows:
Fe^2+ ==> Fe^3+ + e
[Cr2O7]^2- + 6e + 14H^+ ==> 2Cr^3+ + 7H2O

Now you multiply each equation by a number to make the electrons equal; i.e., multiply equation 1 by 6 and multiply equation 2 by 1. Add the two, cancel the electrons and you will have the final net ionic equation.

Answer 2

What happened to the Na?

Answer 3

Na is soluble and disappears because it is a spectator ion