122ch13e - 45 13.63) Colligative properties depend on the...

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45 13.63) Colligative properties depend on the concentration of particles in solution. P A = X A A , ) P = X solute solvent , ) T f = i K f m , ) T b = i K b m , A = i M R T In the last 3 equations, the “ i ” is the number of particles in the formula for the substance. i = # solute particles in solution - integer for ideal behavior i = 1 for a non-dissociating or non-ionizing compound (nonelectrolyte) = # particles (ions) resulting from the formula unit a) A 0.10 m aqueous NaCl solution has a higher boiling point than a 0.10 m aqueous C 6 H 12 O 6 solution. This is because the NaCl is ionic and when put in H 2 O it dissociates (comes apart) to form ions. It forms 2 ions, Na + and Cl , for every NaCl. Thus, 0.10 moles of NaCl will give 0.20 moles of ions (particles) in solution. The C 6 H 12 O 6 is a molecular non-ionizing solute and stays together as a single particle when it dissolves (as most, but not all, molecular substances do). So 0.10 moles of C 6 H 12 O 6 will give 0.10 moles of
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This note was uploaded on 07/17/2008 for the course CHEM 122 taught by Professor Zellmer during the Summer '07 term at Ohio State.

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122ch13e - 45 13.63) Colligative properties depend on the...

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