Procedure 25 mL. of cyclohexane, 35 mL of toluene, and 2-3 boiling stones in a p
ID: 564331 • Letter: P
Question
Procedure 25 mL. of cyclohexane, 35 mL of toluene, and 2-3 boiling stones in a page 145 of your lab heat the flask ath assemble the apparatus for simple distillation shown on ext, Make sure all the ground glass connections are tight, and about one drop per second. Record the bolling of distillate in y aly until boiling starts. Adjust the heat until the distillate collects at our laboratory notebook. After S0 ml of distillate is collected, point and total volume for every 5 ml distillation Dismantle the equipment after the apparatus has cooled, distillation flask into the CHO waste. Save the distillate for the fractional distillation in step 3 r graph of boiling point versus total volume of distillate in mL for the simple aimationabel the axes properly. Mark the boiling points of cyclohexane and 2. Plot a o me on the yaxis. Attach your graph to the lab report. This step may be done at home. Observations Record any important observations you make during the course of the distillation, such as temperature fluctuations, appearance of the vapor front as it moves through the apparatus, cooling efficiency of the condenser, changes in rate of distillation, etc. Post Lab Questions 1. How does the boiling point of water in Denver compare with the boiling point of water in Broken Arrow? Explain the difference. 2. What is the function of boiling stones in your distillation flask?Explanation / Answer
Q As pressure decrease the boiling point deceased because boiling point is the temperature at which the vapour pressure becomes equal to atmospheric pressure so at low pressure more vapour is formed therefore we have to heat more to make vapour pressure equal to atmospheres atmospheric pressure
Q boiling stones is used to trap air and bubble formed in distillation flask therefore it is added to avoid bumping of the liquid during boiling in distillation flask.
Q When comonents is not air or water sensitive and also have lower boiling point we can emloyedbut when high boiling points components we have to reduce boiling point by adding steam in case of steam distillation or by lowering pressure as in vaccum distillation. Vaccum distillation is employed when air or water sensitive components is there while if we want to avoid thermal decomposition we still employ steam distillation.
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