Question

Choose the correct combination among thefollowing
A) A mixture of weak acid and its salt of strong base acts as acidic buffer.
B) As number of moles of acid or base required to change the $p^H$ of the buffer by one unit increases, the quality of buffer increases.
C) Buffer action is maximum at $p^H=P^{Ka}$ in case of acidic buffer.

• A. All are correct
• B. A only correct
• C. B only correct
• D. A only false

Answer 1

The correct option is A All are correct

A: According to definition of acidic buffer solution option A is right.

B: As number of moles of acid or base increases in buffer solution the concentration of $\left[H^{+}\right]$ and $\left[O{H}^{-}\right]$ also increases and this increases the quality of buffer. Hence option B is right.

C; for maximum buffer capacity conc of acid = conc of salt
$\therefore pH=p{K}_a$ hence option C is right.