A technique of laboratory synthesis of potassium formate has been developed. Phase equlibria in mixtures of the components of the binary system potassium formate - water in the range from -70 to +170°C were investigated by the visual-polythermal method. For the first time the phase diagram of the specified system has been con structed and the coordinates of an eutectic point has been estab lished. The formation of a crystalline hydrate КНСООИ.бНгО incon gruous melting at -9.2°C was found in this system.
