Question

What is the pH of a buffer solution that is 0.36 M chloroacetic acid and 0.19 M sodium chloroacetate? Ka = 1.3 10-3.

Answer 1

Step-by-step explanation:

It is known that formula to calculate the pH of acidic buffer solution is as follows.

pH =
`pK_(a) + log(([salt])/([acid]))`

It is given that [salt] (sodium chloroacetate is 0.19 M and [acid] (chloroacetic acid) is 0.36 M. Hence, putting the given values into the above formula as follows.

pH =
`pK_(a) + log(([salt])/([acid]))`

=
`-log K_(a) + log(([salt])/([acid]))`

=
`-log (1.3 * 10^(-3) + log (0.19)/(0.36)`

= 2.602

Thus, we can conclude that pH of given buffer solution is 2.602.