A buffer solution is composed of 4.00 4.00 mol of acid and 3.25 3.25 mol of the conjugate base. If the p K a pKa of the acid is 4.70 4.70 , what is the pH of the buffer?

The pH of the buffer is 4.61

Explanation:

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 = 4.70

= moles of conjugate base = 3.25 moles

 = Moles of acid = 4.00 moles

pH = ?

Putting values in above equation, we get:

Hence, the pH of the buffer is 4.61

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