# If a buffer solution is 0.250 M 0.250 M in a weak base ( K b = 8.0 × 10 − 5 ) Kb=8.0×10−5) and 0.540 M 0.540 M in its conjugate acid, what is the pH ?

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## Question:

If a buffer solution is 0.250 M 0.250 M in a weak base ( K b = 8.0 × 10 − 5 ) Kb=8.0×10−5) and 0.540 M 0.540 M in its conjugate acid, what is the pH ?

9.57

Explanation:

Given that: Considering the Henderson- Hasselbalch equation for the calculation of the pOH of the basic buffer solution as: So, pH + pOH = 14

So, pH = 14 – 4.43 = 9.57

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