At $25^{\circ} \mathrm{C}$, the concentration of $\mathrm{H}^{+}$ions in $1.00 imes 10^{-3}$ M aqu

Question

At $25^{\circ} \mathrm{C}$, the concentration of $\mathrm{H}^{+}$ions in $1.00 	imes 10^{-3}$ M aqueous solution of a weak monobasic acid having acid dissociation constant ( $K_{a}$ ) of $4.00 	imes 10^{-11}$ is $X 	imes 10^{-7} \mathrm{M}$. The value of $X$ is $\_\_\_\_$ .\ Use: Ionic product of water $\left(K_{w}ight)=1.00 	imes 10^{-14}$ at $25^{\circ} \mathrm{C}$\

Professor PC Thomas Classes · Answer

(2.23): Given $\left[\mathrm{H}^{+}ight]=X 	imes 10^{-7} \mathrm{M}$\ $K_{a}=4 	imes 10^{-11}$\ $K_{w}=1 	imes 10^{-14}$ at $25^{\circ} \mathrm{C}$\ Let the weak monobasic acid be $H A$\ The acid dissociates as :