Answered: b. Calculate how many g of ammonium…

Chemistry & Chemical Reactivity

10th Edition

ISBN:9781337399074

Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Chapter13: Solutions And Their Behavior

Section: Chapter Questions

Problem 107SCQ

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You are asked to prepare a temperature bath that freezes at –12.5 °C using only water and ammonium sulfate. Kf for water is 1.86 °C/m and Kb for water is 0.51 °C/m. The normal freezing point is 0.00 °C and the normal boiling point is 100.0 °C. Use 132.14 g/mol as the molar mass for ammonium sulfate.
a. Name the three colligative properties discussed in class and write the mathematical expressions that describe each.

b. Calculate how many g of ammonium sulfate you would need to prepare this temperature bath which freezes at –12.5 °C if you use 500. g of water.
c. What would the boiling point of this solution be in °C? Give your answer with one decimal.

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