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Ammonia, NH3, is a gas. Perhaps you are thinking of the situation where ammonia gas is dissolved in water. In that case the ammonia reacts to a slight extent with the water to produce some hydroxide ions, and it is the hydroxide ions which make the solution basic.

NH3(aq) + HOH(l) --> NH4+ + OH-

That covers the Arrhenius theory of acids and bases, where a base is a substance that increases the concentration of hydroxide ions.

In the Bronsted-Lowry theory, a base is a proton acceptor. NH3 accepted a proton from water to make NH4+, the conjugate acid.

In the Lewis theory, a base is an electron pair donor. There is a lone pair of electrons on the nitrogen. This allows NH3 to be an electron pair donor, and therefore, a Lewis base.

Yes ammonia is a base.All acid , base neutralisation reactions need not produce water.Ammonia directly reacts with acids and produce salts.

NH3 + HCl -------------->NH4Cl

Ammonia is a base, as it has a pH of above 7, meaning it has a greater hydrogen ion concentration than nuetral water. I'm sorry, I wish I could explain further, but it has been so long since chemistry.

Any substance react with water if it produce H+ ions i.e also called base(remember that)

NH3+H2O----------- NH4+ +OH-

It is abase since it has lone pair of electrons on nitrogen atom