Answer: The pH of the buffer is 4.61
Explanation:
To calculate the pH of acidic buffer, we use the equation given by Henderson Hasselbalch:
[tex]pH=pK_a+\log(\frac{[\text{conjuagate base}]}{[\text{acid}]})[/tex]
We are given:
[tex]pK_a[/tex] = negative logarithm of acid dissociation constant of weak acid = 4.70
[tex][\text{conjuagate base}]}[/tex] = moles of conjugate base = 3.25 moles
[tex][\text{acid}][/tex] = Moles of acid = 4.00 moles
pH = ?
Putting values in above equation, we get:
[tex]pH=4.70+\log(\frac{3.25}{4.00})\\\\pH=4.61[/tex]
Hence, the pH of the buffer is 4.61
