Many fluoridation facilities now use fluorosilicic acid

Chapter 13, Problem 148AP

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Many fluoridation facilities now use fluorosilicic acid instead of sodium fluoride. Fluorosilicic acid typically is distributed as a 23 percent \((1.596 \mathrm{~m})\) aqueous solution.

(a) Calculate the van't Hoff factor of fluorosilicic acid given that a 23 percent solution has a freezing point of \(-15.5^{\circ} \mathrm{C}\).

(b) The density of 23 percent fluorosilicic acid is \(1.19 \mathrm{~g} / \mathrm{mL}\). Given that the osmotic pressure of the solution at \(25^{\circ} \mathrm{C}\) is 242 atm, calculate the molar mass of fluorosilicic acid.

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