Ammonium hydroxide

Ammonium hydroxide (NH₄OH) is a name sometimes given to an aqueous solution of ammonia. Ammonia is more basic than water, and hence ammonium and hydroxide ions are be present in an aqueous solution of ammonia according to the following equilibrium:

NH₃ + H₂O ↔ NH₄⁺ + OH^-

With a base-ionization constant (K_b) of 1.8×10^-5, in a 1M ammonia solution about 0.4% of the ammonia will be protonated to ammonium ions (equivalent to a pH of 9.4).

See also

• conjugate acid and conjugate base