Properties of halogen compounds

-(a) Solubility of halogen compounds.—Determine whether bromobenzene is soluble in the following Water, alcohol, ether, concentrated sulphuric acid, dilute hydrochloric acid, and a solution of sodium hydroxide. 

Pour a few drops of the liquid or place a few crystals on the gauze and place it for an instant in a flame. Remove the gauze and note whether soot is formed by holding the burning substance in front of a piece of white paper. Determine whether the following substances burn, and whether soot is produced Benzene, bromobenzene, dibromobenzene, benzyl chloride, ethyl bromide, chloroform, carbon tetrachloride. What conclusions can be drawn from the experiment (See the note to experiment 164d, page 134.) 

1 A solution which can also be used for the test may be prepared by dissolving about 0.5 gram of clean sodium, free from any crust, in 20 cc. of alcohol and adding a few drops of water. 

—(c) In applying this test it is necessary to determine first whether the compound contains any fine halogen acid, which has been produced as the result of decomposition on standing. Shake a little of the substance with water, and test the aqueous solution with silver nitrate. If a precipitate is formed, the halide must be washed with water until the latter gives no test for halides. 

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