Write the equation for the reactions between malic acid and fumaric acid with magnesium and sodium carbonate.

Answer 1

Are you looking for the rxn between formic acid and MgCO3 then formic acid and Na2CO3. Then between malic acid and MgCO3 and Na2CO3?
Your implication is that formic acid reacts with malic acid. If they react I don't know about it but I'm not an organic chemist. Perhaps they do.