Potassium citrate is a kind of citric acid salts whose molecular formula is K3c6h5o7. It is a white, slightly hygroscopic crystalline powder. It is odorless and has a taste of saline. As a food additive, potassium citrate is used to regulate acidity and supplement the potassium nutrient sources. Medically, it can be used to control the uric acid or cystine from or kidney stones.