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18/10/2021 2:14 pm
Topic starter
NaOH is a strong base. What will be pH of 5.0 × 10-2 M NaOH solution ? (log 2 = 0.3)
(a) 14.00
(b) 13.70
(c) 13.00
(d) 12.70
1 Answer
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18/10/2021 2:17 pm
Correct answer: (d) 12.70
Explanation:
Given [OH-] = 5 × 10-2
∴ pOH = - log 5 × 10-2
= - log 5 + 2 log 10 = 1.30
∵ pH + pOH = 14
∵ pH = 14 - pOH
= 14 - 1.30 = 12.70