Acids are usually compounds of non metals with Hydrogen and sometimes Oxygen. There are also organic acids.
Acids are corrosive and can burn flesh and dissolve metal.
Bases and Alkalis A Base is a substance that gives OH - ions when dissolved in water. The solution of a base in water is called an alkali . Salts A Salt results when an acid reacts with a base. Both are neutralised. The non metalic ions of the acid and the metal ions of the base form the salt.