Properties that depend only on how many particles are dissolved. The elevation of boiling point, the depression of freezing point and osmotic pressure, and the van’t Hoff factor for solutes that split or join.
3 lessons, about 1 h 30 min3 simulations11 problems5 practice questionsPython in every lesson
Created by StemPy LabSalt on an icy road melts the ice, and antifreeze keeps the water in a car radiator liquid on a frosty night. Both effects depend on how many particles are dissolved, not on what they are. You will find the rise of the boiling point and the fall of the freezing point, and use them to weigh an unknown molecule.
A dried raisin put into water swells, and strawberries under sugar leak juice. In both, water crosses a thin skin in one direction. You will find the pressure that stops this flow, use it to weigh very large molecules, and see how reverse osmosis turns sea water into drinking water.
Dissolve a mole of salt in a kilogram of water and the freezing point falls almost twice as far as for a mole of sugar. The salt has split into ions. You will correct the colligative formulas with the van’t Hoff factor, and use it to find how much of a solute splits or joins.
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