5.4. Oxidation no.-1 the properties of the halides, p114

Procedure 1

1.     take 6 test-tubes and a holder, 0.1M solutions of K/Na halides into beakers

2.     add every halide to 2 tubes, to half add ammonia and note colour.

3.     leave other half for sunlight for 1hour

2. 1. Moisten stips of filterpaper with lead(II) ethanoate and potassium dicromate.(just put them ready)

2.     Take now solid halide salts and put 0.1g (fills round bit) to 12 test-tubes, add H₂SO₄ and warm if necessary.

3.     Add 10drops of conc. H2SO4 and test with moistened filter paper

4.     Add 10drops of conc. H3PO4 and test with moistened filter paper.

3. 1. collect the gas into apparatus as in fig. p115 (dry testtubes, solid phosphoric)

Use 6 testtubes, bunsen to warm, 2g of halide and phosphoric and corks to prevent escaping.

Invert a tube in water and remove cork to observe solubility. Residue is air.

Take a glass rod dipped into conc. ammonia and hold near the mouth of test-tube

Heath the end of nicrome wire or glass rod and put into the gas.