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Basic Buffer Action

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Question

How to calculate OH- concentration in 0.02N HCl solution

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Solution

Given: Concentration of HCl = 0.02 N
To find: Concentration of hydroxide
Solve: As we know
pH = =log [H⁺]
pH = -log [0.02]
= 1.7
As we know
pH + pOH = 14
pOH = 14-pH
pOH= 14 – 1.7
=12.3
Now, pOH = -log [OH^-]
12.3 = -log [OH^-]
[OH^-] = 5.01 x 10^-13 M
So, concentration of hydroxide ions is 5.01 x 10^-13 M

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