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Question

Calculate the pH of a solution obtained by mixing 0.1 litre of pH=4 and 0.2 litre of pH=10.

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Solution

If pH is 4 it means it is a weak acid and if pH is 10 it's a strong Base
Acid-Base,
Given,
Va=100mL, Vb=200mL
Na=104, Nb=104

N=vbnb-vana/va+vb
N=VbNbVaNaVa+Vb
=200×104100×104300`
=0.3×104
By applying log we will get pOH=4.5229
As we know pH+pOH=14
Then,pH=9.4771

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