What is Potassium citrate?
Potassium citrate (also known as tripotassium citrate) is a potassium salt of citric acid with the molecular formula C6H5K3O7. It is a white, hygroscopic crystalline powder. It is odorless with a saline taste. It contains 38.3% potassium by mass. In the monohydrate form it is highly hygroscopic and deliquescent.
As a food additive, potassium citrate is used to regulate acidity and is known as E number E332. Medicinally, it may be used to control kidney stones derived from either uric acid or cystine.