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When 2.50 g of an unknown weak acid (HA) with a molar mass of 85.0 g/mol...

When 2.50 g of an unknown weak acid (HA) with a molar mass of 85.0 g/mol is dissolved in 250.0 g of water, the freezing point of the resulting solution is -0.259 ∘C.

Calculate Ka for the unknown weak acid.

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