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What is the p O H of 0.1 M K B (salt of weak acid and strong base) at 2 5 o C ? (Given: p K b of B - = 7 )

Correct answer

4

Step-by-step solution

For salt of weak acid and strong base; p H = 7 + 1 2 p K a + 1 2 l o g C a t 25 o = 7 + 1 2 × 7 + 1 2 l o g 10 - 1 = 7 + 3.5 - 0.5 ∴ p H = 10 So, p O H = 4 a t 25 o C

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