Question

Buffer solutions have constant acidity and alkalinity because :

• A. These give unionised acid on reaction with added acid or ionised acid on reaction with alkali
• B. Acids and bases in these solution are shielded from attack by other ions
• C. They have large excess $H^{+}$ or $O{H}^{-}$ ions
• D. They have fixed value of $pH$

Answer 1

The correct option is A These give unionised acid on reaction with added acid or ionised acid on reaction with alkali

On adding small amount of acid $\left(H^{+}\right)$ and base $\left(O{H}^{-}\right)$, weak acid or weak base will be form respectively.
For example : addition of acid to acetic acid and acetate buffer, will form acetic acid and base forms acetate.