This app was mentioned in 6 comments, with an average of 1.00 upvote
I know of something very like that!
BEAKER - THIX Education - Google Play Android App
It features 150 chemicals that you can mix together, while showing you all the chemical reaction formulas. You can also add heat or "shake" your phone to mix the solutions.
There is a very simple app for android called "BEAKER - Mix Chemicals" that allows you to simulate simple inorganic chemistry reactions. Though this definitely shouldn't be used as a learning tool.
Edit: added Google play link
I think I know what you're talking about. Sounds like Beaker?
https://play.google.com/store/apps/details?id=air.thix.sciencesense.beaker