Monopotassium phosphate (MKP) (also, potassium dihydrogen phosphate, KDP, or monobasic potassium phosphate) is the inorganic compound with the formula KH2PO4. Together with dipotassium phosphate (K2HPO4.(H2O)x) it is often used as a fertilizer, food additive, and buffering agent. The salt often cocrystallizes with the dipotassium salt as well as with phosphoric acid. Single crystals are paraelectric at room temperature. At temperatures below −150 °C (−238 °F), they become ferroelectric.Potassium Phosphate Monobasic Anhydrous AR (Analytical Reagent grade), also known as monopotassium phosphate, is a high-purity inorganic salt used as a precision buffering agent in laboratory research and industrial applications. The “AR” grade signifies it meets strict standards for analytical use, ensuring a minimum purity of 99.5%