What happens to the pH of Ammonia when an acid is added to it? What is the chemical reaction that occurs?

Answer 1

The pH goes down. This is called a red-ox reaction (reduction/oxidation).

Answer 2

Amonia is alkaline in aqueous solution and so has a high pH. The pH will reduce as you add the acid. you will end up with water and a salt.
One of the most characteristic properties of ammonia is its power of combining directly with acids to form salts; thus with hydrochloric acid it forms ammonium chloride (sal-ammoniac); with nitric acid, ammonium nitrate, etc. However perfectly dry ammonia will not combine with perfectly dry hydrogen chloride, a gas, moisture being necessary to bring about the reaction.[13]

NH3 + HCl → NH4Cl

The salts produced by the action of ammonia on acids are known as the ammonium salts and all contain the ammonium ion (NH4+).

Answer 3

I would say that the PH value would drop towards the acid end of the scale and that the reaction would depend on the acid and the strength ot the acid.

Answer 4

you get water and salt