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MHT CET 202625 AprilMorning Shift
Exam
MHT CET
Year
2026
Date
25 April
Shift
Morning Shift
Subject
Chemistry
Chapter
Ionic Equilibrium

MHT CET 2026 · 25 April · Morning Shift · Chemistry · Ionic Equilibrium

The hydrogen ion concentration of the ocean is about 2 × 10^ -9 \ M...

The hydrogen ion concentration of the ocean is about 2×10−9 M2 \times 10^{-9}\ \text{M}. What is the pOH of ocean?

Options

  1. A8.858.85
  2. B5.35.3
  3. C7.857.85
  4. D8.78.7

Correct answer

B. 5.35.3

Step-by-step solution

Given [H+]=2×10−9 M[H^+] = 2 \times 10^{-9}\ \text{M}

The pH of the solution is calculated as:

pH=−log⁡[H+]\text{pH} = -\log[H^+]

pH=−log⁡(2×10−9)=9−log⁡2\text{pH} = -\log(2 \times 10^{-9}) = 9 - \log 2

Using log⁡2=0.3010\log 2 = 0.3010:

pH=9−0.3010=8.699≈8.7\text{pH} = 9 - 0.3010 = 8.699 \approx 8.7

We know that at 25^{}^{\circ}\text{C}, pH+pOH=14\text{pH} + \text{pOH} = 14

pOH=14−pH\text{pOH} = 14 - \text{pH}

pOH=14−8.7=5.3\text{pOH} = 14 - 8.7 = 5.3

Answer: 5.35.3
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