Questions
The dissociation constant of weak acid HA is . After making the necessary approximations, calculate pH of 0.1 M acid.
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By Expert Faculty of Sri Chaitanya
a
1.155
b
2.155
c
3.155
d
4.155
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Correct option is D
For weak acid Ka =C α2.∴ α = KaC = 4.9× 10-80.1 = 7× 10-4[ H+]=Cα PH=-log [ H+]=-log Cα =-log 7× 10-4× 10-1 = 4.1549 = 4.155
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The hydrogen ion concentration in weak acid of dissociation constant and concentration c is nearly equal to
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