what is a buffer solution?

The solutions which resist change in pH on dilution or with the addition of small amounts of acid or alkali are called?Buffer Solutions.
Example:?a mixture of ammonium cholride and ammonium hydroxide acts as a buffer solution?around?pH 9.25 and a mixture of acetic acid and sodium acetate acts as a buffer solution?around pH 4.75
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A buffer solution is one which resists changes in pH when small quantities of an acid or an alkali are added to it.
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