The dissociation constant of acetic acid is x × 10^-5. When 25 mL of 0.2 M CH_3 COONa solution is mixed with 25 mL of 0.02 M CH_3 COOH solution, the…

The dissociation constant of acetic acid is $\displaystyle x \times 10^{-5}$. When $\displaystyle 25$ mL of $\displaystyle 0.2 \mathrm{M} \mathrm{CH}_3 \mathrm{COONa}$ solution is mixed with $\displaystyle 25$ mL of $\displaystyle 0.02 \mathrm{M} \mathrm{CH}_3 \mathrm{COOH}$ solution, the pH of the resultant solution is found to be equal to $\displaystyle 5$ . The value of $\displaystyle x$ is $\displaystyle \_\_\_\_$