In general, a buffer solution may be made from known quantities of a weak acid and a salt of the weak acid. Some examples of buffers are phosphate buffer (H2PO- and HPO2) ; acetate buffer (CH3COOH and CH3COO-). The pH of a buffer solution varies directly with the ratio of concentrations of its base and acid members.
The following are some of the important examples of duffers.
- A mixture of acetic acid and sodium acetate.
- A mixture of formic acid and barium formate
- Mixture of hydrogen cyanide and potassium cyanide
- A mixture of carbonic acid and sodium carbonate
- A mixture of phthalic acid and potassium hydrogen phthalate
- A mixture of boric acid and borax.