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The dissociation constant of a weak acid...

The dissociation constant of a weak acid is `10^(-6)` . Then the `P^(H)` of 0.01 Nof that acid is

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Given` pH = 4, [H^(+)] = 10^(-4)`M
`[H^(+) ]= sqrt(K_a C), 10^(-4) = sqrt( 10^(-7) C )`
Initial concentration of the weak acid, HA = C = 0.1 mol `L^(-1)`
Final concentration of the acid` HA=( 10 xx 0.1 ) /( 1000 ) = 10^(-3) mol L^(-1)`
Final `[H^(+) ]= sqrt(K_a C) =sqrt(10^(-7) xx 10^(-3)) = 10^(-5) M`
Final `pH = -log 10^(-5)` = 5.
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