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Describe the process for preparation of iron (III) chloride

      

Describe the process for preparation of iron (III) chloride.

  

Answers


Kavungya
Precaution.
- Experiment should be done in a fume cupboard or in the open.
Reason:
- Chlorine gas is poisonous and will thus be harmful to the human body.

Procedure:
- Dry chlorine gas is passed over iron wool as per the diagram.

Conditions.
Chlorine gas has to be dry (done by the anhydrous calcium chloride in the U-tube)
Reason:
To prevent hydration hence oxidation of iron (which will then form Fe2O3.5H2O) hence preventing reaction between iron and chlorine.
Iron metal must be hot; and this is done by heating.
Reason:
To provide activation energy i.e. the minimum kinetic energy which the reactants must have to form products.
- Anhydrous calcium chloride.
- In the U-tube; to dry the chlorine gas.
- In the thistle funnel; to prevent atmospheric water vapour (moisture) from getting into the apparatus and hence reacting with iron (III) chloride.

Observations:
- Iron metal glows red-hot.
- Red brown fumes (FeCl3(g)) are formed in the combustion tube.
- A black solid (FeCl3(s)) is collected in the flask.
Note:
- Iron (III) chloride cannot be easily collected in the combustion tube.
Reason:
- It sublimes when heated and hence the hotter combustion tube causes it to sublime and its vapour is collected on the cooler parts of the flask.

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Kavungya answered the question on April 29, 2019 at 09:15


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