A 0.100-g sample of the weak acid HA (molar mass 5 100.0

Chapter 17, Problem 17.119

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A 0.100-g sample of the weak acid HA (molar mass 5 100.0 g/mol) is dissolved in 500.0 g of water. The freezing point of the resulting solution is 20.00568C. Calculate the value of Ka for this acid. Assume molarity equals molality in this solution.

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