25-Colligative-Prob

# 25-Colligative-Prob - COLLIGATIVE PROPERTIES OF SOLUTIONS...

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COLLIGATIVE PROPERTIES OF SOLUTIONS GCHEM II CONCEPT PROBLEMS Colligative physical properties depend on quantity of solute particles not the chemistry of particles. Molality (m ) = (mole solute* i) / kilo-gram solvent where i = numbers solute particles per molecule. Freezing Point Depression ( o C): T f = – K f * m where K f ( o C/m) is freezing point constant of solvent, m (moles solute particles/kg solvent) is molality solution, and T f (– o C) is freezing point depression. Final Freezing Pt: K f = negative; T freezing = T final – T initial; T final = – T freezing + T initial. Boiling Point Elevation ( o C): T b = + K b * m where + K b ( o C/m) is boiling point constant of the solvent, m = (moles solute particles/kg solvent) is molality solution, and T b (+ o C) is boiling point elevation. Final Boiling Pt: K b = positive; + T boiling = T final – T initial; T final = + T boiling + T initial. Osmotic Pressure ( π ) = (n/V) * RT = MRT where n (moles) /V (volume) = molarity (M) and R is gas con- stant (.08206 (L-atm/mole-K) and T is Kelvin temperature (T) and units of osmotic pressure are (atmospheres).

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