(a) What to you understand by the term acid?

(b) Name the positive ion formed when an acid is dissolved in water.

(c) Draw the structure of this ion.

Water is never added to acid in order to dilute it. Why?

Define the term 'basicity' of an acid. Give the basicity of: nitric acid, sulphuric acid and phosphoric acid.

Give two examples of each of the following :

(a) oxy-acid

(b) hydracid

(c) tribasic acid

(d) dibasic acid