Colligative Properties: b. Is the triple point for water above or below 1 atm of

Question

Colligative Properties:

b. Is the triple point for water above or below 1 atm of pressure?

c. If sodium chloride is added to a solution of water, its vapor pressure decreases in comparison to a solution of pure water. Add this altered vapor pressure curve on the phase diagram constructed above.

4. Why does the vapor pressure of a solution decrease with the addition of a non-volatile solute?

5. Determine the van’t Hoff factor for each of the compounds listed below:

a. Glucose (C6H12O6)

b. Sodium sulfate

c. Ammonium phosphate

6. Out of three 1.0 m solutions of glucose (C6H12O6), sodium sulfate and ammonium phosphate which will have the highest boiling point, lowest freezing point, and lowest vapor pressure?

Explanation / Answer

4. Because addition of non-volatile solute molecules occupies some of the surface area.

so that No of molecules converting into vapor decreases,that results decrease in vapor pressure.

5. a. Glucose (C6H12O6)   = i = 1

    b. Sodium sulfate (Na2SO4) = i = 3

    c. Ammonium phosphate (NH4)3PO4 = i = 4

6. DTb = i*kf*m

if molality is same By increasing vanthoff factor boiling point increases.

similarly ,

freezingpoint decreaes, vapor pressure decreases.

so that

highest boiling point,lowest freezing point,and lowest vapor pressure = (NH4)3po4

ammoniumphosphate.

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