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QUESTION

Ammonia gas is alkaline or acid?

Ammonia gas behaves as an alkali in water........................

Ammonia gas is exceptionally soluble in water, and an experiment called the "ammonia fountain" (which you'll have to seek out on the interwebz) spectacularly demonstrates this. In aqueous solution, ammonia behaves as a weak base, and the given equilibrium lies somewhat to the right:

NH_3(aq) + H_2O(aq) rightleftharpoons NH_4^+ + HO^- ;K_"eq"=10^(-4.75)

If you are in first year university, can you tell me the pH of a 1*mol*L^-1 solution of NH_3(aq)?

K_"eq"=10^(-4.75)=([NH_4^+][HO^-])/([NH_3(aq)])