Abuffer solution is composed of 1.00 mol of acid and 2.25 mol of the conjugate base. if the p k a of the acid is 4.90 , what is the ph of the buffer?

The pH of the buffer is 5.25

Explanation:

Let the volume of buffer solution be V

We know that:

To calculate the pH of acidic buffer, we use the equation given by Henderson Hasselbalch:

We are given:

= negative logarithm of acid dissociation constant of weak acid = 4.90

pH = ?

Putting values in above equation, we get:

Hence, the pH of the buffer is 5.25

dynamic equilibrium is the answer.