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Definition A buffer solution is one which resists changes in pH when small quantities of an acid or an alkali are added to it. Acidic buffer solutions An acidic buffer solution is simply one which has a pH less than 7. Acidic buffer solutions are commonly made from a weak acid and one of its salts-often a sodium salt.
Temperature change affects Ka, Kb, and Kw. Therefore, pH of buffers is influenced by temperature. Each buffer is influenced differently. Some buffers decrease in pH (e.g. boric acid- sodium borate) while others increase in pH (e.g. acetic acid- sodium acetate) as temperature increase.