NH4C4H4O6

NH4C4H4O6 is the chemical formula for ammonium bitartrate, also known as monoammonium tartrate. It is a salt formed from the reaction of ammonia and tartaric acid. This compound typically appears as a white crystalline solid. It is moderately soluble in water. Ammonium bitartrate is closely related to potassium bitartrate, commonly known as cream of tartar, which also plays a role in wine production and baking.

In the context of winemaking, ammonium bitartrate can form from the tartaric acid present in grape juice. While potassium bitartrate is the more prevalent precipitate, ammonium bitartrate can also contribute to the solid deposits that form in wine, particularly during fermentation and aging. Its presence is generally considered a natural byproduct of the winemaking process. It is not typically used as a food additive itself, but its formation is a consequence of the natural chemistry of fruit juices. Ammonium bitartrate has limited industrial applications beyond its association with the broader chemistry of tartrates.