1. Before which of the functional group tests discussed in this lab should acetone not be used to clean the test tube (Baeyer's Test, Ceric ammonium nitrate, 2,4-dinitrophenylhydrazine, Tollen's test, Litmus test).

2. Qualitative functional group tests, such as those shown here, should always be run in duplicate or triplicate. Why is this the case?

3. Determine the functional group present in each of the following unknowns:

Unknown A is soluble in water, the pH of the resulting solution is 7.2, and addition of ceric ammonium nitrate (CAN) to Unknown A results in a dark red solution.
Unknown B is insoluble in water, 6 M NaOH, and 6 M HCl; addition of CAN results in a yellow solution; addition of silver nitrate with heating produces a precipitate that does not dissolve in nitric acid.
Unknown C is insoluble in water, insoluble in 6 M NaOH, but soluble in 6 M HCl.
Unknown D is soluble in water (pH 6.95), results in a yellow solution upon the addition of CAN, does not form a precipitate with silver nitrate, but does form a precipitate upon addition of 2,4-diphenylhydrazine. Addition of Tollen's reagent followed by heating produces no reaction.
4. Describe the next test that you would perform for Unknown X in the following case:

Unknown X is insoluble in water, but is soluble in 6 M NaOH.

Unknown A is soluble in water, the pH of the resulting solution is 7.2, and addition of ceric ammonium nitrate (CAN) to Unknown A results in a dark red solution.

Look for an alcohol.