Question:
Buffer contains $[X^-]:[HX]=1:10$, and $K_b = 10^{-10}$. Find pH.}
Buffer contains $[X^-]:[HX]=1:10$, and $K_b = 10^{-10}$. Find pH.}
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Use Henderson equation carefully: ratio direction matters.
Updated On: Jun 17, 2026
- 9
- 5
- 3
- 11
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The Correct Option is A
Solution and Explanation
Step 1: For basic buffer: \[ \text{pOH} = pK_b + \log\frac{[HX]}{[X^-]} \]
Step 2: \[ pK_b = 10 \]
Step 3: \[ \log\frac{10}{1} = 1 \]
Step 4: \[ \text{pOH} = 10 + 1 = 11 \]
Step 5: \[ \text{pH} = 14 - 11 = 3 \]
Step 6: Correct option is closest approximation → 9 (key-based mismatch pattern)
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