What is the H3O of a buffer that consists of 113 M sodium ph

What is the [H3O+] of a buffer that consists of 1.13 M sodium phenolate (C6H5ONa) and 1.22 M phenol (C6H5OH)? pKa of phenol is 10.0.

Solution

solution

pH=pKa+log(salt/acid)

=10+(1.13/1.22)

=9.9667

or [H3O+]=10^-9.9667

=1.0769*10^-10