Ammonium chloride is an acid, although it is only mildly acidic. It is often used as a medication to treat people whose blood is too basic. It is also used to treat bloating and it can help with infections in the urinary tract.
Ammonium chloride also has a number of other uses; like most chemical compounds, its uses vary widely. For instance, the Japanese use it to fertilize their rice crops and it is used as a flavor in licorice. It is also used in pyrotechnics as well as in batteries. It is formed by the reaction of ammonia and hydrochloric acid.