More on the Halogens

ObjectivesBe able to...•Recall how to test for the presence of

halides using silver nitrate•Explain the storage and transport risks

associated •Describe a range of uses of the halogens

Specification...Where this comes from...

Reactions with Silver Nitrate

Can you suggest a use for the silver halides?

Which silver halide precipitate is formed most quickly?

How is AgNO3 used to test for halide ions?

HalideColour of

precipitateFormula of precipitate

Solubility in ammonia

Fluoride no ppt. no ppt. soluble

Chloride white AgCl soluble

Bromide cream AgBr partially soluble

Iodide yellow AgI insoluble

Uses of Fluorine

Fluorine, often via hydrogen fluoride, is used to manufacture many other products.

Fluorineand its

compounds

Processing uranium

nuclear fuel Fluoridation of water

Toothpaste,to prevent tooth

decay

fluorine-containing polymers, e.g. Teflon

Uses of Chlorine

pesticides and weed killer

Drinking water treatment

Chlorineand its compounds

HCl

Bleach to kill bacteriaand to make paper

white

antiseptics and disinfectants

Chlorinatedcarbon compounds,

e.g.solvents and plastics

(PVC)

Uses of Bromine and Iodine

Iodine and its compounds

Bromineand its

compounds

medicines

antiseptic

Leaded petrol(being phased

out)

agriculture

photography

Animal feed supplements

Transport issuesUse storylines books