What other things can be done with fumaric acid/sodium carbonate?

[Aetherius Rimor]

So I have quite a bit of extra fumaric acid, sodium carbonate, naptha and acetone, and I was wondering if there are any other fun chemistry type experiments I can do with it.

Not looking for anything specific, just something I can practice chemistry with and see results with to make sure I got it right.

Any ideas?