Question 1

What personal protective equipment should you wear before setting up a distillation apparatus?

Accepted Answer

Before beginning laboratory work, put on a lab coat, splash-proof safety glasses, and nitrile gloves. These items protect you from chemical splashes, vapors, and skin contact with solvents used during distillation experiments. Always ensure all protective equipment is properly fitted and in good condition before starting any lab procedure.

Question 2

How should the thermometer be positioned in a distillation apparatus?

Accepted Answer

Insert the thermometer into the thermometer adapter by gently pushing and twisting it through the top. Adjust the thermometer until the bulb sits below the bend in the distilling head. This positioning ensures accurate temperature readings of the vapor being distilled, which is critical for collecting the correct fraction.

Question 3

What is the correct orientation for connecting the condenser to the distillation setup?

Accepted Answer

Clamp the condenser to a stand oriented diagonally toward the side joint of the distilling head. Connect rubber tubing from the tap water faucet to the inlet port, which is further from the distilling head, and attach the outlet port to the drain. This configuration ensures efficient cooling of vapors as they pass through the condenser.

Question 4

How should water flow through the condenser during distillation?

Accepted Answer

Water enters through the inlet port, which is the port further from the distilling head, and exits through the outlet port closer to the distilling head. This countercurrent flow maximizes heat exchange efficiency, keeping the condenser jacket cool and ensuring effective vapor condensation throughout the distillation process.

Question 5

What heating equipment is used to control temperature during distillation?

Accepted Answer

A heating mantle placed on a stir plate provides controlled heat to the round-bottom flask. The heating mantle connects to a temperature controller, which regulates the heating rate and maintains consistent temperatures. This setup allows precise control over the distillation process and prevents overheating of the sample.

Question 6

How should solvents be prepared and stored for student use during a distillation experiment?

Accepted Answer

Pour appropriate amounts of each solvent into labeled glass bottles so students can measure their portions without handling large stock bottles. For example, if each group needs 2 mL of toluene and 2 mL of cyclohexane, prepare enough for all groups. Store these prepared solvents in the instructor hood for safe student access during the experiment.

Question 7

What role do joint clips play in assembling a distillation apparatus?

Accepted Answer

Plastic joint clips secure each connection point throughout the distillation apparatus, including where the distilling head connects to the flask and where the condenser attaches to the distilling head. These clips prevent glassware from separating during heating and ensure a stable, leak-free setup for safe and effective distillation.

간단한 증류

액체의 증기압은 얼마입니까?

액체는 어느 시점에서 끓나요?

혼화성 액체의 혼합물에서 용액은 어떤 온도에서 끓습니까?

액체 혼합물을 증류하는 동안 시간이 지남에 따라 증류액의 조성은 어떻게 변합니까?

증류에서 액체와 증기의 조성을 결정하기 위해 증기-액체 평형 다이어그램은 어떻게 사용됩니까?