Potassium Phosphate
K3 P O4

{Merck Index - © 1952 by Merck & Co., Inc.}

Potassium Phosphate - Dibasic: Dipotassium phosphate; dipotassium hydrogen phosphate. K2HPO4; mol. wt 174.18. K 44.89%, PO4 54.53%, P 17.79%.

White, somewhat hygroscopic granules. Very soluble in water, slightly in alcohol. Converted into pyrophosphate by ignition. The aq. soln. is slightly alkaline to phenolphthalein Keep well closed.

Grades available: Reagent, technical.

Potassium Phosphate - Monobasic: Potassium biphosphate or acid phosphate; potassium dihydrogen phosphate; monopotassium phosphate. KH2PO4; mol. wt. 136.09. K 28.73%, PO4 69.79%, P 22.76%.

Colorless crystals or white, granular powder; permanent in air; at 400° loses H2O, forming metaphosphate. d. 2.34. Soluble in about 4.5 parts water; insoluble in alcohol. pH: 4.4-4.7.

Use: In buffers for determination of pH.

Grades available: Reagent, technical.

Med. Use: To acidify the urine. Caution: Large doses are cathartic. Dose: 0.6 g.

Potassium Phosphate - Tribasic: Tripotassium phosphate. K3PO4; mol. wt. 212.27. K 55.25%, PO4 44.75%, P 14.59%. Usually contains about one mol. H2O (9%) and small amount of carbonate.

White, deliquesce, granular powder. m. 1340°. Very soluble in water; insoluble in alcohol. The aq. soln. is strongly alkanne. Keep well closed.

Grades available: Reagent, technical

Use: Hydroculture.

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