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  4. In a buffer, if the ratio of salt and acid is increased 10 times, then pH will:

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Q. In a buffer, if the ratio of salt and acid is increased $10$ times, then $pH $ will:

Rajasthan PMTRajasthan PMT 2004

Solution:

From Handerson's equation :
$pH =p K_{a}+\log \frac{\text{[Salt ]}}{\text{[ acid ]}}$
Hence, on increasing ${\text{[Salt ]}}{\text{[ acid ]}} $ by ten times $pH$ will increase by one.
(As, $\log \frac{\text{[Salt]}}{[\text {acid] }}$ will be equal to $\log 10$ i.e., one)