II III I C. Johannesson III. Colligative Properties (p. 436 - 446) Ch. 13 & 14 - Solutions.

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Presentation transcript:

II III I C. Johannesson III. Colligative Properties (p ) Ch. 13 & 14 - Solutions

C. Johannesson A. Definition  Colligative Property property that depends on the concentration of solute particles, not their identity

C. Johannesson B. Types  Freezing Point Depression  Freezing Point Depression (  t f ) f.p. of a solution is lower than f.p. of the pure solvent  Boiling Point Elevation  Boiling Point Elevation (  t b ) b.p. of a solution is higher than b.p. of the pure solvent

C. Johannesson B. Types View Flash animation.Flash animation Freezing Point Depression

C. Johannesson B. Types Solute particles weaken IMF in the solvent. Boiling Point Elevation

C. Johannesson B. Types  Applications salting icy roads making ice cream antifreeze cars (-64°C to 136°C) fish & insects

C. Johannesson C. Calculations  t :change in temperature (° C ) k :constant based on the solvent (° C·kg/mol ) m :molality ( m ) n :# of particles  t = k · m · n

C. Johannesson C. Calculations  # of Particles Nonelectrolytes (covalent) remain intact when dissolved 1 particle Electrolytes (ionic) dissociate into ions when dissolved 2 or more particles

C. Johannesson C. Calculations  At what temperature will a solution that is composed of 0.73 moles of glucose in 225 g of phenol boil? m = 3.2m n = 1  t b = k b · m · n WORK: m = 0.73mol ÷ 0.225kg GIVEN: b.p. = ?  t b = ? k b = 3.60°C·kg/mol  t b = (3.60°C·kg/mol)(3.2m)(1)  t b = 12°C b.p. = 181.8°C + 12°C b.p. = 194°C

C. Johannesson C. Calculations  Find the freezing point of a saturated solution of NaCl containing 28 g NaCl in 100. mL water. m = 4.8m n = 2  t f = k f · m · n WORK: m = 0.48mol ÷ 0.100kg GIVEN: f.p. = ?  t f = ? k f = 1.86°C·kg/mol  t f = (1.86°C·kg/mol)(4.8m)(2)  t f = 18°C f.p. = 0.00°C - 18°C f.p. = -18°C