First slide

Acidic buffer

Question

$P^{H}$ of an acidic buffer is 5.8. $p^{ka}$ of weakacid is 4.8. 100 ml of 1M BA(salt) is mixed with ‘V’ ml of 0.1 M weakacid (HA). Value of ‘V’ is

Moderate

A

10 ml
B

1 ml
C

100 ml
D

1000 ml

Solution

$p^{H} = p^{ka} + \log \frac{V_{s} N_{s}}{V_{a} N_{a}}$
5.8 = 4.8 + $\log \frac{100 (1)}{V (0.1)}$
log 10 = $\log \frac{100}{0.1 V}$
10 = $\frac{100}{0.1 V}$
V = 100 ml

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