class11_coll prop HW

class11_coll prop HW - Name _Chem 108 Section # _...

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Name _________________________Chem 108 Section # ________ Class 11 Page 6 Group Work Colligative Properties Homework: Due Friday April 4 1. An aqueous solution freezes at 2.47 ° C. What is its boiling point? (for H 2 O, K f = 1.86 ° C/m, K b = 0.52 ° C/m) Show all of your work and include UNITS. a) 102.47 ° C b) 97.53 ° C c) 100.69 ° C d) 99.31 ° C e) 101.33 ° C f) 98.67 ° C HINTS : First determine the freezing point depression ( Δ T f ). What is the molality of the solution? Determine the change in the boiling point ( Δ T b ).for a solution with the molality that you just calculated. 2. Which one of the following aqueous solutions will have the highest boiling point? Label each of the solutes as strong, weak, or non-electrolytes. a) 0.5 m NaCl b) 0.8 m C 12 H 22 O 11 c) 0.4 m CH 3 COOH d) 0.5 m MgCl 2 e) 0.6 m Na 2 SO 4 HINTS : The change in boiling point ( Δ T b ) increases as molality of particles increases. (It is a colligative property.) To determine which solution has the highest boiling point:
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class11_coll prop HW - Name _Chem 108 Section # _...

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