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Which of these substances has the highest pOH?

0.10 M HCl, pH = 1


0.001 M HNO3, pH = 3


0.01 M NaOH, pH = 12

User Kaleb
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2 Answers

4 votes
0.10 M HCl, pH = 1 A
User Marco Schoolenberg
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Answer: 0.10 M HCl, pH = 1

Explanation: pH or pOH is the measure of acidity or alkalinity of a solution.

pH is calculated by taking negative logarithm of hydrogen ion concentration and pOH is calculated by taking negative logarithm of hydroxide ion concentration.


pH=-\log [H^+]


pOH=-log{OH^-}


pH+pOH=14

1. 0.10 M
HCl, pH=1


1+pOH=14


pOH=13

2. 0.001 M
HNO_3, pH=3


3+pOH=14


pOH=11

3. 0.01 M
NaOH, pH=12


12+pOH=14


pOH=2

Thus 0.10 M HCl, pH = 1 has highest pOH.

User Noisy Cat
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