Isohydric solutions are the solutions having the same concentration of hydronium ion. If 0.2 M - HA solution is isohydric with 4 * 10^-4 M - solution, then Kb of A- is

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Isohydric solutions are the solutions having the same concentration of hydronium ion. If 0.2 M - HA solution is isohydric with 4 * 10^-4 M - $HCl$ solution, then Kb of A- is

Prashant Kotian · Accepted Answer

Correct answer: B. [H+] = 4*10^-4 M. Ka = [H+]^2/C = (4*10^-4)^2 / 0.2 = 8.0*10^-7. Kb = Kw/Ka = 10^-14 / 8.0*10^-7 = 1.25*10^-8.

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