Many fluoridation facilities now use fluorosilicic acid
Chapter 13, Problem 148AP(choose chapter or problem)
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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