7.44 The ionization constant of phenol is 1.0 × 10–10. What is the concentration of phenolate ion in 0.05 M solution of phenol? What will be its degree of ionization if the solution is also 0.01M in sodium phenolate?

Ionization of phenol:
As the value of the ionization constant is very less, x will be very small.  Thus, we can ignore x in the denominator.
Now, let $\propto$ be the degree of ionization of phenol in the presence of
Also,
${\mathrm{C}}_{6}{\mathrm{H}}_{5}\mathrm{OH}+{\mathrm{H}}_{2}\mathrm{O}↔{\mathrm{C}}_{6}{\mathrm{H}}_{5}{\mathrm{O}}^{-}+{\mathrm{H}}_{3}{\mathrm{O}}^{+}$
Conc.  0.05 - 0.05 $\mathrm{\alpha }$             0.05 $\mathrm{\alpha }$         0.05$\mathrm{\alpha }$