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Ammonia is soluble in water, forming ammonia water and producing weak ionization effect: NH₃•H₂O NH+OH-
At standard conditions, ionization equilibrium constant Kb=1.8×10-5. Ammonia water can be used as chemcial reagent and dilute ammonia water functions as quick-acting fertilizer.
In the case of the rain and lightning, nature can produce ammonia water.

Chemical properties
1. Ammonia water is slightly corrosive and carbonated ammonium water is heavily corrosive.
2. Ammonia can react with acid to form ammonium salt.