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The dissociation constant of weak acid H...

The dissociation constant of weak acid `HA` is `4.9xx10^(-8)`. After making the necessary approximations, calculate `pH` in `0.1 M` acid.

Text Solution

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Molarity(C) = 0.10
`[H^(+)]sqrt(K_(a).C) = 7 xx 10^(-5)M`(`alpha` is negligible)
pH = 4.15
`[OH^(-)] = K_(w)/[H^(+)] = 10^(-14)/7xx10^(-5) = 1.43 xx 10^(-10)M`
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