First slide

Ionization constants of weak bases, PH of weak bases

Question

The dissociation constant of a weak acid is 10^-6. Then the pH of 0.01 N of that acid is

Easy

A

2
B

7
C

8
D

4

Solution

P^H of a weak acid solution is given as follows
$\large \large {P^H} = {\text{ }}\frac{1}{2}\left[ {{P^{{K_a}}} - \log C_0} \right]$
$\large \Rightarrow {P^H} = {\text{ }}\frac{1}{2}\left[ {6 + 2} \right] = 4.$

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