# CEMISTRY

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Consider a weak acid HX. If a 0.10 M solution of HX has a pH of 5.87 at 25°C, what is ΔG° for the acid's dissociation reaction at 25°C?

• CEMISTRY -

pH = -log(H^+) = approxmately 1E-6
Solve for (H^+).
..........HX ==> H^+ + X^-
initial...0.1.....0......0
change...-x.......x......x
equil...0.1-x.....x.......x

Ka = (H^+)(X^-)/(HX)
Then dGo = -RTlnK

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