The nature of a solution whether neutral , acidic or basic depends upon its pH value. The pH of a solution changes when an acid or base added to it . Howerver the pH of the solution is maintained by the addition of a suitable buffer whether acidic or basic.
(a) Define a buffer solution (b) Give one example each of acidic and basic buffers. (c) Define pH of a solution .

Explanation

(a) for the definition of buffer solution consult section 7.29.
(b) Acidic buffer : Aqueous solution of acetic acid the and sodium acetate.
Basic buffer : Aqueous solution of ammonium hydroxide and ammonium chloride.
(C) For the definiation of pH consult section 7.24