Match the following aqueous solutions with the appropriate letter to the right.

Question

Match the following aqueous solutions with the appropriate letter to the right. (can you guys please show steps if possible? i'm trying to figure it out and i must be doing it the wrong way)

9b) 1. 0.16 m Na2SO4 A. Highest boiling point

2. 0.15 m ZnBr2 B. Second highest boiling point

3. 0.17 m BaBr2 C. Third highest boiling point

4. 0.55 m Urea(nonelectrolyte) D. Lowest boiling point

10b.) 1. 0.13 m Pb(NO3)2 A. Lowest freezing point 2. 0.12 m Fe(NO3)3 B. Second lowest freezing point 3. 0.15 m Zn(NO3)2 C. Third lowest freezing point 4. 0.42 m Ethylene glycol(nonelectrolyte) D. Highest freezing point

Explanation / Answer

Salt Molality i factor Kb Value Elevation in BP Actual BP Elevated BP Na2SO4 0.16 3 2.53 1.2144 1429 1430.2144 2nd highest ZnBr2 0.15 3 2.67 1.2015 697 698.2015 3rd Highest BaBr2 0.17 3 2.83 1.4433 1835 1836.4433 Highest Urea 0.55 1 2.7 1.485 150 151.485 Lowest Kf Value Depression in MP Actual MP Depressed MP Pb(NO3)2 0.13 3 3.52 1.3728 270 268.6272 Highest Fe(NO3)3 0.12 4 3.29 1.5792 47.2 45.6208 2nd lowest Zn(NO3)2 0.15 3 4.75 2.1375 110 107.8625 3rd lowest Ethylene Glycol 0.42 1 9.62 4.0404 -12.9 -16.9404 Lowest FP

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