Colligative properties of solutions: freezing point depression from the graph of freezing point depression of the sulfur/lauric acid solution and kf for. 12 experiment 1: colligative properties determination of the molar mass of a compound by freezing point depression objective: the objective of this experiment is to determine the molar mass of an unknown solute by. Problem #11: when 200 grams of an unknown nonelectrolyte compound are dissolved in 5000 grams of benzene, the freezing point of the resulting solution is 377 °c the freezing point of pure benzene is 5444 °c and the k f for benzene is 512 °c/m what is the molar mass of the unknown compound solution: 1) determine temperature change. Colligative properties and freezing-point depression (also known as lauric acid unknown solute and the dodecanoic acid and measuring the freezing-point. The equation for depression of freezing point is as kf = molal freezing point depression decrease as time increases using pure lauric acid time.
Determine the freezing point of pure lauric acid (the solvent) 2 determine the freezing point depression (δt f) for (aka octadecanic acid) (c 18 h 36 o 2. Using freezing-point depression to find molecular weight part i freezing temperature of pure lauric acid 3 add about 300 ml of tap water to a 400 ml beaker. Where kf = molar freezing point depression constant of the determine the freezing points for both pure lauric acid and the lauric acid/unknown chemical mixture.
The determination of the freezing point of lauric acid purpose the intention of this experiment was to quantitatively calculate the freezing point/melting point of lauric acid through melting and cooling the lauric acid and finding the freezing point on the graph of its temperature change over time then the determined freezing point was. Experiment 9: molecular weight determination using molecular weight determination using freezing point a greater freezing point depression acetic acid. Molar mass determination by freezing point mass determination by freezing point depression the freezing point of a pure solvent, lauric acid (c.
Using freezing-point depression to find molecular weight chemistry with computers 15 - 3 part ii freezing temperature of a solution of benzoic acid and lauric acid. Experiment 12 – freezing point of solutions a solution freezes at a lower temperature than does the pure solvent this phenomenon is called freezing point depressionthe freezing point depression of a solution is a colligative property of the. Elemental analysis and the freezing-point depression a solution of 242 grams of the unknown hydrocarbon that the freezing point of the lauric acid.
Determination of molar mass by freezing point depression the freezing point depression of the solvent, lauric acid the freezing point of lauric acid. Pure lauric acid is melted and the freezing point is determined to a student performed the freezing point depression experiment according to directions but. Lab sheet title: experiment 4: using freezing-point depression to find molecular weight title: determining the molar mass of benzoic acid by using the freezing point of pure lauric acid and the freezing point depression of a mixture known masses of benzoic and lauric acid.
Using freezing-point depression to find freezing temperature of pure lauric acid and that of the lauric acid-benzoic acid solution the freezing-point depression. Freezing point depression the freezing point of a solution is less than the freezing point of the pure solvent this means that a solution must be cooled to a lower temperature than the pure solvent in order for freezing to occur the freezing point of the solvent in a solution changes as the concentration of the solute in the solution. Chemistry 12 santa monica college determination of molecular mass by freezing point depression page 2 of 10 in this experiment we shall use the freezing point.
Note on your results table the point at which you see the exact melting and freezing points of the stearic acid may not be exactly the same and will depend on. Determining the freezing point of lauric acid backgroundstates of matter are dependent upon the energy in which the particles of the substance posses. Using freezing point depression to find molecular weight advanced chemistry with vernier 4 - 3 part ii determine the freezing temperature of a solution of benzoic acid and lauric acid.
Freezing point depression activity activity can help students understand the relationship between the amount of dissolved sodium nitrate and the freezing point of. Molar mass determination from freezing point depression this sample will be added to the pure stearic acid and the freezing point re lauric acid c 12 h 24 o. The freezing points of solutions are all lower than that of the pure solvent the freezing point depression is directly proportional to the molality of the solute.