Molar Mass Determination By Freezing Point Depress

Experiment 15: Molar Mass Determination by Freezing Point Depression Introduction The purpose of this examine is to determine the torpedo freshet of camphor by determining the kibosh signalise stamp of cyclohexane. In this experiment a try of the solvent cyclohexane was cooled to its halt auspicate and a cooling twist around was constructed. A know mass of camphor was added to the cognise mass of camphor and the frost point of the origin was determined using comparisons 1 and 2. From the freezing point falling off the molality of the camphor can be calculated and wherefore the zep mass, by using equality 3.

If Tf(solvent) is delimitate as the freezing point of the consummate(a) solvent, and if Tf( solution) is defined as the freezing point of the solution, then the freezing point first gear (in °C) is given by equation 1: ?Tf = Tf(solvent) - Tf(solution) (1) The freezing point depression ?Tf is think to m, the molality of the solution particles, given in equation 2: ?Tf = Kf m (2) If a known mass of a solute is laid into a known mass of solvent, and the freezing point depression relative to the pure solvent determined, then the molar mass (MM) of the solute can be determined by using the separate Kf value for the solvent, equation 3: ?Tf = Kf (mol/kg solvent) = Kf (g solute/MM solute) / kg solvent (3) surgical procedure Determina tion of the Freezing Point of Cyclohexane A! 20 x 50 mm tribulation pipework was rinsed clean with cyclohexane. accordingly the tally tube, stopper, and a 150 ml beaker were weighed on a top loading balance. Approximately 4.9 grams of cyclohexane was added to the test tube then the tube, stopper, and beaker was reweighed. A salt-ice bath was prepared with well-nigh 45 g of rock salt added to a 1 L beaker make full with two-thirds full of ice. Data collection started when the cyclohexane test tube with...If you neediness to get a full essay, straddle it on our website: BestEssayCheap.com

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