Freezing Point

Experiment 1 Freezing Point Depression of Electrolytes Colligative properties atomic number 18 properties of solutions that cypher on the concentrations of the samples and, to a first approximation, do not calculate on the chemical nature of the samples. A colligative position is the difference betwixt a retention of a outcome in a solution and the same property of the unadulterated solvent: vapor extort lowering, boiling lay elevation, block point depression, and osmotic pressure. We are delicious for the frost point depression of aqueous solutions of ethylene glycol or propene glycol in the winter and are continually pleasurable to osmotic pressure for transport of water across membranes. Colligative properties lease been used to determine the molecular weights of non-electrolytes. Colligative properties can be bear witness reasonably well by a unproblematic comparison for solutions of non-electrolytes. The abnormal colligative properties of ele ctrolyte solutions supported the Arrhenius theory of ionization. Deviations from ideal behavior for electrolyte solutions organise to the determination of activity coefficients and the development of the theory of interionic attractions.

The par for the frost point depression of a solution of a non-electrolyte as a function of molality is a very simple whizz (as you may remember from GEN CHEM): ? TF = K F m (1) The constant KF, the freezing point depression constant, is a property only of the solvent, as given by the following equation, whose etymologizing is available in umteen physical chemistry text s1: ( ) o 2 MW(Solvent)R TF KF = ! 1000 ? H F (2) In equation (2), R is the gas constant in J/K*mol, TFo is the freezing point of the solvent (K), ?HF is the heat of conference of the solvent in J/mol, and the factor of 1000 is supreme to convert from g to kg of water for molality. For water, KF = 1.860 o/molal from the properties of pure water and from experimental data on the freezing point depressions of dilute...If you want to get a full essay, depute it on our website: BestEssayCheap.com

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