Many fluoridation facilities now use fluorosilicic acid instead of sodium fluoride. Fluorosilicic acid typically is distributed as a 23 percent (1.596 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°C. (b) The density of 23 percent fluorosilicic acid is 1.19 g/mL. Given that the osmotic pressure of the solution at 25°C is 242 atm, calculate the molar mass of fluorosilicic acid.
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