Chemistry - Ionic Equilibrium Question with Solution | TestHub

If 1 mM solution of ethylamine produces $\mathrm{pH}=9$, then the ionization constant $\left({\mathrm{K}}_{\mathrm{b}}\right)$ of ethylamine is $10^{-x}$. The value of $x$ is ______ (nearest integer). [The degree of ionization of ethylamine can be neglected with respect to unity.]