The value of pH of  $\left({\mathrm{K}}_{\mathrm{a}}=1.74×{10}^{-5}\right)$ is-

1. 3.4

2. 3.6

3. 3.9

4. 3.0

Hint: $\left[{\mathrm{H}}^{+}\right]=\sqrt{{\mathrm{K}}_{\mathrm{a}}.\mathrm{C}}$

Step 1:

Calculate the concentration of H+ ion as follows:

Given that, $\left({\mathrm{K}}_{\mathrm{a}}=1.74×{10}^{-5}\right)$

Concentration of