Exercise 06: Chloroform

Question 1

1. Place 2 mL of the sample solution in a test tube.
2. Add _____ and 5 drops of alcoholic or aqueous potassium hydroxide.
3. Warm the mixture until observable change (10 mins).
4. Observe the results.

Answer 1

Isocyanide Test (Phenyl-Carbylamine’s Reaction, Hoffman’s Isocyanide Reaction)
2. 2 drops of Aniline

Question 2

1. Mix 2 mL of _____ with 5 drops of sodium hydroxide solution and finally 2 mL of the sample containing chloroform.
2. Heat the mixture to boiling (10 mins).
3. Observe the results.

Answer 2

Schwartz’s Resorcinol Test
1. 5% Resorcinol Solution

Question 3

1. To 2 mL of the sample solution.
2. Add a few drops of _____ (it is made by dissolving a few grains on a few mL of aqueous potassium hydroxide solution).
3. Observe the results.

Answer 3

Lustgarten’s Naphthol Test
2. Alpha Naphthol Solution

Question 4

1. Mix 2 mL of _____ with 3 mL of 10% sodium hydroxide solution.
2. Heat to boiling.
3. Add 1 mL of the sample to be tested.
4. Observe the results.

Answer 4

Fujiwara’s Pyridine Test
1. Pyridine

Question 5

Two (2) Types of Reduction Test

Answer 5

1. Fehling’s Test
2. Tollen’s Test

Question 6

1. Place 1 mL of sample in a test tube.
2. Warm the sample with a few drops of the Fehling’s reagent.

Answer 6

Fehling’s Test

Question 7

1. Add excess of ammonium hydroxide solution to silver nitrate solution then the sample containing chloroform.
2. Heat to boiling.
3. Observe the results.

Answer 7

Tollen’s Test

Question 8

1. Place 1 mL of the sample solution in a test tube.
2. Add a small amount of ammonium chloride (1 pinch) and 2 mL alcoholic potassium hydroxide in a test tube.
3. The tube is stoppered with cork containing long glass tubing and heated for 1 hr in a water bath.
4. Cool the solution and test the presence of hydrocyanic acid by the Prussian blue test.
5. Observe the results.

Answer 8

Cyanide Test