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freezing point depression method
Member rating: No Rating | Words: 2638 | Submitted: Mon Jun 11 2007
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Experiment 5 Title: Determining molecular weight by freezing point depression method. Objectives: - To determine freezing point of a substance from cooling curve. - Study effect of foreign substance content on freezing point of a solvent. - Determine molecular weight using freezing point depression. Theory & Background: Dissolution of a substance is a solvent suppresses the freezing point of the solution formed. The freezing depression depends on the amount of the material dissolved in the solvent according to the following equation:- ?T = Kf m = Kf x ____ __mass of material_______ Molecular weight X Kg solvent Where, ?T = freezing point depression Kf = freezing point molar constant of solvent m = molal concentration = mass of material/molecular weight x kg solvent = No.of moles of solute/kg solvent Naphthalene is a crystalline, aromatic, white, solid hydrocarbon, best known as the primary ingredient of mothballs. Naphthalene is volatile, forming a flammable vapor. Its molecules consist of two...
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