Characters. - In small, colourless, four or six-sided prisms.

Reactions. - It gives the reactions showing the presence of tartaric acid and potassium like the bitartrate, but it is readily distinguishable by its greater solubility in water.

Impurity. - Bitartrate.

Test. - Entirely dissolved by its own weight of water.

Dose. - As a diuretic, 20-60 grains. As a purgative, 1/4-1/2 ounce.

Uses. - In small doses it is absorbed, converted into carbonate in the blood and acts as a diuretic, antilithic, etc, like the acetate and citrate. In larger doses it acts as a purgative, like other saline cathartics.