A particular sample of vinegar has a pH of 2.95. If acetic acid is the only acid that vinegar contains (Ka=1.8×10−5), calculate the concentration of acetic acid in the vinegar.

The concentration of acetic acid in the vinegar is

Explanation:

To calculate the pH of the solution, we use the equation:

We are given:

pH = 2.95

Putting values in above equation, we get:

The chemical equation for the ionization of acetic acid follows:

The expression of for above equation follows:

We are given:

Putting values in above expression, we get:

So, the concentration of acetic acid =

Hence, the concentration of acetic acid in the vinegar is