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The ion, NH₄⁺, formed by combination of NH₃ and H⁺ (the pK_a value is 9.24); behaves as a univalent metal in forming a. compounds.

- a. benzoate has been used as a stimulant, diuretic, urinary antiseptic, and antirheumatic.

- a. carbonate (NH₄)₂CO₃; a cardiac and respiratory stimulant and carminative expectorant.

- a. chloride NH₄Cl; a stimulant expectorant and cholagogue; used to relieve alkalosis and to promote lead excretion; a urinary acidifier. SYN: sal ammoniac.

- dibasic a. phosphate (NH₄)₂HPO₄; used for fireproofing, in baking powder, and as an antirheumatic.

- a. ferric sulfate SYN: ferric a. sulfate.

- a. ichthosulfonate SYN: ichthammol.

- a. iodide NH₄I; an expectorant.

- a. mandelate mandelic acid a. salt; a urinary antiseptic.

- a. molybdate used in electron microscopy as a negative stain, and as a reagent for alkaloids and other substances.

- monobasic a. phosphate used in baking powder.

- a. nitrate used in making nitrous oxide gas, in freezing mixtures, matches, and fertilizers; also used in veterinary medicine.

am·mo·ni·um ə-'mō-nē-əm n an ion NH₄⁺ derived from ammonia by combination with a hydrogen ion and known in organic compounds (as quaternary ammonium compounds) and in compounds (as salts) that resemble in properties the compounds of the alkali metals