First slide

Acidic buffer

Question

A buffer solution consists of 1 mole each of HA and its conjugate base A^–. Addition of which of the following decreases the pH of buffer?

Easy

A

0.1 mole of HA
B

0.1 mole A^-
C

0.1mole of NaOH
D

Water

Solution

p^Hof an acidic buffer is given as
$\large {P^{{K_a}}}\; + \log \frac{{\left[ {salt} \right]}}{{\left[ {acid} \right]}}$
on increasing '[acid]', P^H of the solution decreases.

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