Ammonium hydroxide (NH₃[aq]), also known as ammonia water, ammonical liquor, ammonia liquor, aqua ammonia, or aqueous ammonia, is a solution of ammonia in water. Although its name suggests a salt of the formula NH₄OH, it is not actually possible to generate samples of NH4OH - it exists only in dilute aqueous solutions.

A soft white powder, Ca(OH)₂, used in making mortar, cements, calcium salts, paints, hard rubber products, and petrochemicals. Also called slaked lime.

Nickel(II) hydroxide (Ni(OH)2) is an insoluble compound commonly used in rechargeable battery electrodes. When charged these electrodes form nickel(III) oxide-hydroxide. Nickel(II) hydroxide is a precipitate formed when the hexaaquanickel(II) ion is mixed with aqueous ammonia.

Zinc hydroxide Zn(OH)₂ is an inorganic chemical compound. It also occurs naturally as 3 rare minerals: wülfingite (orthorhombic), ashoverite and sweetite (both tetragonal).