What are the kinds of acid?

Answer 1

There are many different classifications:

1. strong or weak
2. organic and inorganic
3. 'hydro xxx-ic' acids and oxy-acids ('xxx-ic' or 'xxx-ous')
4. monoprotic and multi-protic (up to 3 or 4)
5. gaseous or non-gases
6. colored or colorless,

   and maybe some more uncommon ways of classifying.

Answer 2

There are two main categories of acids: mineral acids (e.g. sulfuric acid, hydrochloric acid) and organic acids (e.g. citric acid, acetic acid). Acids are characterized by their ability to donate protons in a chemical reaction, lowering the pH of a solution.