Two stoichiometries are discussed: NH4H(C2H3OH(CO2)2) with one ammonium ion per formula unit, and (NH4)2(C2H3OH(CO2)2).

Malate, the conjugate base of malic acid, is chiral.

The monoammonium salt has been crystallized as the monohydrate.

[1] As a food additive, diammonium malate has been used as flavoring agent and as an acidity regulator.

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