If the K a of a monoprotic weak acid is 1.0 × 10 − 6 , what is the [ H + ] of a 0.22 M solution of this acid?

The concentration of hydrogen ions is

Explanation:

We are given:

Concentration of acid = 0.22 M

The chemical equation for the dissociation of monoprotic weak acid follows:

Initial:             0.22

At eqllm:       0.22-x    x     x

The expression of for the above equation follows:

We are given:

Putting values in above equation, we get:

Neglecting the negative value of 'x', because concentration cannot be negative

So, equilibrium concentration of hydrogen ions = x = 0.00047 M =

Hence, the concentration of hydrogen ions is

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