Explanation:
Let the reaction equation for the dissociation of weak acid is as follows.
Initial: 0.87 0 0
Change: -x +x +x
Equilibrium: 0.87 - x +x +x
Hence, expression for the dissociation constant will be as follows.
Now, putting the given values into the above formula as follows.
x = 0.000283
Hence, at equilibrium the concentration of hydrogen ions is 0.000283.
or,
Also,
=
= 0.00151
And, the percentage of dissociation is = 0.151%
Thus, we can conclude that percent dissociation of given weak acid is 0.151%.