Characters. - A white powder, of saline feebly acid taste, deliquescent, and very soluble in water.

Reactions and Tests. - Heated with sulphuric acid it forms a brown fluid, gives off an inflammable gas and evolves the odour of acetic acid (citrate). Its solution gives the reactions of potassium (p. 603) and, mixed with a solution of chloride of calcium, remains clear till it is boiled, when a white precipitate separates which is readily soluble in acetic acid. This precipitate is citrate of calcium, which is less soluble in hot than in cold water.

Dose. - 20 to 60 grains.

Uses. - Is very pleasant to the taste, produces no local action and is very soluble. It is thus easily absorbed into the blood, and there becomes carbonate. It is less liable to purge than other potassium salts, and can thus be given in larger doses. After absorption it acts like the carbonate, causes diuresis and lessened acidity or even alkalinity of the urine, and probably influences tissue-change as well. It is antiscorbutic.