Tripotassium, trihydrate

E. G. Parker prepared trihydrated tripotassium phosphate, KSP04.3H20. 

To prepare sodium/potassium acetate buffer potassium acetate, 647.68 g sodium acetate trihydrate, 299.20 g tripotassium citrate, 8.8 g glacial acetic acid, 220 ml deionized water to 2.2 litres... 

HEXACYANOFERRATE(III) TRIPOTASSIUM (13746-66-2) Mixtures with water, acids, alcohols cause slow decomposition, producing hydrocyanic acid. Explosive reaction with ammonia. Violent reaction with copper(II) nitrate, trihydrate. Incompatible with chromium trioxide, sodium nitrite. 

There is also uncertainty with respect to the degree of hydration of the tripotassium phosphate. Ravich (1) reported the existence of a stable heptahydrate and trihydrate and a metastable enneahydrate. However, it is possible that there is some error in his assignment of stability and metastability to the eutonic solutions.. Some authors (2,6) also report the existence of an octahydrate as the stable phase at room temperature, but neither Ravich (7,8) nor Berg (9-11) observed an octahydrate in their detailed studies of the K2O-P2O5-H2O system. Therefore, the evaluator concludes that the existence of the octahydrate has not been established. 

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