1. What is the process of "seeding", as it applies to recrystallization? What purpose does it serve?
2. How can the purity of a recrystallized solid be assessed?
3. Why is it important to:
a. avoid the inhalation of organic solvents?
b. know the position and procedure of operation of the nearest fire
extinguisher when employing diethyl ether as a recrystallization solvent?
c. use a fluted filter paper for hot filtration
4. Briefly define the following terms:
a. melting‑point range
b. mixture melting point
c. melting point
5.Indicate which of the following statements is true (T) and which false (f) by putting a
check mark in the appropriate space
_ _ a. An impurity raises the melting point of an organic compound.
_ _ b. The sample should not be packed tightly into a capillary melting‑
6. What is the preferred technique for accurately determining the melting point of an
unknown compound in a minimum length of time?
7. How does measuring a mixture melting point help in determining the possible identity of
two solid samples?
8. What is the approximate rate at which the temperature in the Mel-temp should be
increasing at the time the sample undergoes melting?
9. Briefly describe the technique for packing a capillary melting point tube.