Ammonium Hydroxide | Formula, Use, Properties, & Facts | Britannica

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ammonium hydroxide, solution of ammonia gas in water, a common commercial form of ammonia. It is a colourless liquid with a strong characteristic odour. In concentrated form, ammonium hydroxide can cause burns on contact with the skin; ordinary household ammonia, used as a cleanser, is actually dilute ammonium hydroxide.

Also called: ammonia solution, ammonia water, aqueous ammonia, or aqua ammonia (Show more) Related Topics: ammonia hydroxide (Show more) See all related content

The water solution is generally represented by the formula NH4OH, though no appreciable amount of the molecular species NH4OH is present: the solution consists primarily of large quantities of water (H2O) and ammonia (NH3) and smaller quantities of ammonium ion, NH+4 , and hydroxide ion, OH−.

The Editors of Encyclopaedia Britannica This article was most recently revised and updated by Erik Gregersen.