7. Would it work to take the melting point by using the same capillary tube for both trials? Solid melt(1) -solidify melt(2)-

In which of the following scenarios might you expect the observed melting point to be depressed?  Choose all that apply.   a. The heating rate for measuring the melting point was set too high.   b. The percent recovery of recrystallized solid was less than 100%.   c. A solid that was recrystallized from hexane was filtered and dried without washing with additional hexane while it was on the filter funnel.   d. A solid recrystallized from toluene was left on the filter funnel for only a short time before its melting point was measured.    e. The melting point capillary tube was packed with too much material.

Mention one disadvantage of a capillary column as compared to a packed column

What is done if the solid contains a colored impurity? Know the proper funnels and equipment to use. What is done if a solid impurity remains after your desired compound is dissolved in asolvent? When do you read the temperature to determine the boiling point of a liquid whendoing microscale boiling point determination

In the video (liquid-liquid extraction), why is it necessary to turn the separatory funnel upside down and to open the stopcock?

If the stationary phase used in the given setup is silica, which is more polar? A or B?

Determination of melting point can also be done by heating melting point capillary to the thermometer using “Thiele tube”. Draw a complete Thiele tube melting point apparatus. What effect would poor circulation of the melting point bath liquid have on the observed melting point?

Briefly describe the technique for packing a capillary melting point-tube

True or False. It is very important to regulate the temperature of the heating mantle so that the distillation occurs at a rate of about 1 drop per 2 seconds.  Explain why?

Relative amounts of fluid given off and reabsorbed by a model capillary, and what compensates for the difference between filtration and reabsorption