Question

4. Colligative Properties: Consider the following solutions: 1) pure water, and 2) a 0.100 M solution of NaCl. Answer the following questions by circling the correct answer, and then explaining your choice (with words or pictures). 0.100 M NaCl soln pure water [A] Which has the lower freezing point? 0.100 M NaCl soln [B] Which has the lower boiling point? pure water (C) Which has the higher vapour pressure? pure water 0.100 M NaCl soln 5. Osmosis: Draw a picture for each of the following conditions, describing which side of a cell membrane (inside or outside) contains the higher concentration of ions. Indicate the direction of water flow (into or out of the cell). [A] Hemolysis [B] Crenation

Answer 1

Pure water 6.1oom Naul sol 4.A 0-100 M Nace has lower freeaing point than pure water Depression in Freezing boint is colligative property. When ever a solute added to pure xolvent, the freeding point of pure solution is decreases. OTg = Kfm DTS = Depresion in freezing Kf = molal depression constant m= molality of solution B lower boiling point bure Wates) 0.100 M Nau sol I be explained on the basis of elevation of boiling point. Whenever al solute is adged to solvent, the boiling boint of solution increases. AT6 = kom Oto= elevation in boiling point Kb = molal elevation constant m= molality of solution This can be explained o

80 boiling point of solution is greater than puse solvent. pure water has high vapour presure. as lower the boiling point og solution, higher the vapour prenyse og sokation. since, low boiling point means it required less amount of heat and can easily vapounised. Nace solution has high boiling point so low vapour prenure pure water) 0.00 M Nace