Potassium Citrate is a potassium salt of citric acid with the molecular formula C6H5K3O7. Potassium Citrate is a white, slightly hygroscopic crystalline powder. Potassium Citrate is odorless with a saline taste.As a food additive, potassium citrate is used to regulate acidity ,Medicinally, Potassium Citrate may be used to control kidney stones derived from either uric acid or cystine.