Question

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.
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.
What happened to the Na?
Na is soluble and disappears because it is a spectator ion

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