Asolution of hcooh has 0.22m hcooh at equilibrium. the ka for hcooh is 1.8×10−4. what is the ph of this solution at equilibrium?

Answer : The pH of the solution is, 2.21

Solution :  Given,

Concentration (c) = 0.22 M

Acid dissociation constant =

The equilibrium reaction for dissociation of (weak acid) is,

initially conc.         c                       0         0

At eqm.                                      

First we have to calculate the concentration of value of dissociation constant .

Formula used :

Now put all the given values in this formula ,we get the value of dissociation constant .

By solving the terms, we get

Now we have to calculate the concentration of hydrogen ion.

Now we have to calculate the pH.

Therefore, the pH of the solution is, 2.21

the answer is c i believe