Potassium phosphate (potassium phosphate)

Japanese: リン酸カリウム(燐酸カリウム) - りんさんカリウム（英語表記）potassium phosphate

The chemical formula is K ₃ PO ₄ . It is also called tripotassium phosphate. It exists as anhydrous, heptahydrate, and nonahydrate. The anhydrous form is a colorless orthorhombic crystal. The melting point is 1340°C. The specific gravity is 2.564 (17°C). It is highly hygroscopic. The solubility in 100g of water is 193.1g (25°C). Its aqueous solution is strongly alkaline. It is insoluble in ethyl alcohol. The anhydrous form is obtained by reacting phosphoric acid with a calculated amount of potassium hydroxide, evaporating to dryness, and then heating at 300-500°C. When crystallized from an aqueous solution, the heptahydrate is obtained at -13-45.4°C, and the nonahydrate is obtained at temperatures below -13°C.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

化学式K₃PO₄。リン酸三カリウムともいう。無水和物，7水和物，9水和物がある。無水和物は無色斜方晶系結晶。融点1340℃。比重2.564(17℃)。吸湿性が強い。水100gに対する溶解度193.1g(25℃)。水溶液は強アルカリ性。エチルアルコールに不溶。リン酸と計算量の水酸化カリウムを反応させ，蒸発乾固し，さらに300～500℃で熱すると無水和物が得られる。水溶液から結晶させると－13～45.4℃で7水和物，－13℃以下で9水和物が得られる。

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