Olecular weight lab report
Then state the purpose of the experiment.
Determining the molar mass of a volatile liquid by the dumas method lab answers
Next, measure and record the temperature of the water. Pre-laboratory Assignment: Molecular Weight of a Gas Write a balanced equation including state symbols for the reaction that takes place in flask A. As always, you should be wearing your safety goggles. The reaction should begin immediately as evidenced by gas evolution. This is particularly important in this experiment because the instructions do not tell you exactly how to do this. If the ratio is too small, the calculated viscosity would be to small. Record the mass of the flask and the foil to the nearest 0. That is what you will do in the experiment for this lesson.
Attach the flexible end of the tubing to the drying tube. Then show how you calculated the formula weights of the gases. Make sure that the rubber stoppers will fit tightly into the mouth of each Erlenmeyer flask.
V is the total volume and VB is the total volume of the spheres of B present. Determination of Intrinsic Viscometry of Cellulose Acetate. This does in no way represent a perfect lab report and should not be taken as such.
The stopper must fit tightly into the flask.
Be careful to fold and shape the foil only as much as necessary since it is fragile and will easily tear. This experiment is intended to challenge you to figure out how to use the data you collect to determine the molecular weights of several gases.
Dumas method lab report
Record the mass of the flask and the foil to the nearest 0. Error was minimized by allowing one partner to do all of the timing, in an attempt to eliminate this systematic error. This experiment is intended to challenge you to figure out how to use the data you collect to determine the molecular weights of several gases. This step is best performed in the sink as the flask tends to overflow. Do you think that the formula weight can be determined if the formula is not known? Flow rate measurements were made for a solution of cellulose acetate in acetone, a solution of polyvinyl alcohol in water, acetone and water. The volume of water in the flask can now be calculated from the mass and density of water in the flask at the temperature recorded. As always, you should be wearing your safety goggles. The viscosity is proportional to the ratio of the time for the polymer solution to the time for the pure solvent. If you performed more than one trial, show all work for each trial and then compute the average molecular weight. Place about 25 grams of calcium carbonate into the other mL Erlenmeyer flask designated as flask A. Insert the two-holed rubber stopper with the thistle tube and the bent tube into flask A, making sure that the thistle tube is adjusted so that it is beneath the water but not touching the bottom of flask. If the calculated concentrations were to low, this would have resulted in a molecular weight that would be too high. When all is ready pour 5—10 mL of the hydrochloric acid into the top of the thistle tube and allow it to run through the tube and into flask A.
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