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18/10/2021 11:47 am
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What is the pH of a 10-4 M OH- solution at 330K, if Kw at 330K is 10-13.6?
(a) 4
(b) 9.0
(c) 10
(d) 9.6
1 Answer
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18/10/2021 11:50 am
Correct answer: (d) 9.6
Explanation:
Given at 330 K
Kw = 10-13.6
i.e. pKw = pH + pOH
pOH = -log [OH-]
13.6 = pH + pOH
pOH = -log 10-4
pOH = 4
∴ pH = 13.6 - 4 = 9.6