There are a number of ways that you could determine a reactivity series in Chemistry. This is an outline of the steps needed for one of these methods.
To determine the reactivity series of the halogens.
A halogen cannot displace itself from a solution of one of its salts, eg potassium bromine would not displace bromine water, so these combinations are not done.
Record your observations in a table:
|Potassium chloride solution||Potassium bromide solution||Potassium iodide solution||Number of reactions|
|Chlorine||Not done||Solution darkens||Solution darkens||2|
|Bromine||No visible reaction||Not done||Solution darkens||1|
|Iodine||No visible reaction||No visible reaction||Not done||0|
Chlorine could displace bromine and iodine, bromine could only displace iodine, but iodine could not displace chlorine or bromine.
So the order of reactivity is: chlorine > bromine > iodine.
Evaluate the hazards and the precautions needed to reduce the risk of harm. For example:
|Hazard||Possible harm||Possible precaution|
|Chlorine solution||Chlorine gas is produced, which is toxic if inhaled.||Make sure the lab is well ventilated and avoid inhaling the gas.|
|Bromine solution||Toxic bromine vapour is produced. Solution irritates the skin.||Make sure the lab is well ventilated and avoid inhaling the vapour. Wear gloves.|
|Iodine solution||Harmful to the skin. Stains clothes.||Wear gloves. Avoid contact with clothing.|
Explain whether chlorine will react with sodium fluoride solution.
Chlorine is less reactive than fluorine, so it would not displace fluorine from sodium fluoride solution.