If a buffer solution is 0.120 m in a weak base (kb = 6.2 × 10-5) and 0.520 m in its conjugate acid, what is the ph?

Answer : The pH is 9.156.

Solution : Given,

Concentration of weak base = 0.120 M

Concentration of conjugate acid = 0.520 M

Henderson-Hasselbalch equation for weak base and conjugate acid is,

First we have to calculate the value for .

Now put all the given values in above formula, we get the .

As we know,

Therefore, the pH is 9.156.

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