At 40°C, the density of heavy water is 1.02 g/ml and its ionic product is 5.1 * 10^-15. Which of the following is the only incorrect information regarding heavy water at 40°C?

Question

Prashant Kotian · Accepted Answer

Correct answer: C. Molar mass of = 20 g/mol. Density = 1.02 g/mL = 1020 g/L. (a) [] = 1020 / 20 = 51 M (correct). (b) Kd = Kw' / [] = 5.1 * 10^-15 / 51 = 1.0 * 10^-16 (correct). (c) The degree of dissociation α = √(5.1 * 10^-15) / 51 = 1.4 * 10^-9 (not 10^-8, hence incorrect). (d) Molality = 1000 / 20 = 50 m (correct).

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