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Investigating the causes of Corrosion to Iron.

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  • Essay length: 1190 words
  • Submitted: 18/08/2003
GCSE Aqueous Chemistry

An extract from this essay...

Investigating the causes of Corrosion to Iron

Hypothesis

I believe that iron needs both oxygen and water in order to form iron oxide (rust). I also believe that iron oxide formation will not occur when neither oxygen nor water is present (test tube numbers 2, 3, 5, and 8).

Certain factors can affect the reaction rate: limiting reactants i.e. the amount of water, oxygen and iron present and higher temperatures cause a faster reaction rate.

Other reactants may change the reaction completely or alter the reaction rate. In order to test this I added magnesium and salt. Different concentrations of these reactants (diluted and saturated) should also change the reaction rate.

Iron can be coated by a more reactive metal i.e. zinc. This is called galvanization. The zinc is higher up in the reactivity series which causes the oxygen and water to react with the zinc. This is called sacrificial protection because the zinc sacrifices itself to protect the iron. Zinc is often used to protect iron.

The formula for this reaction is:

Oxygen + Iron + Water ? Iron Oxide

O2 + 2Fe + H2O ? Fe2O3 + H2

Health and Safety

The chemicals that are being used are not dangerous provided they are handled as directed by the tutor. Take care when pouring the boiled water into the test tube as it is still hot.

Fair Test

Variables:

* Amount of liquid in the test tubes

* Magnesium

* Salt

* Oil

* Oxygen

* Grease

Factors remaining constant:

* Nail Size (amount of iron)

Apparatus

* Test tubes

* Oil

* Boiled Water

* Sodium Chloride

* Paint

* Stoppers

* Iron Nails

* Galvanized Nails

* Holding rack

Method

Place the test tubes into a holding rack, number them then add the following to the numbered tube.

TEST TUBE NUMBER

CONTENTS OF TEST TUBE

HYPOTHESIS

1

Tap water and iron nail

I feel that the iron in this test tube is likely to rust as oxygen and water can be in contact with the iron.

2

Boiled tap water + oil layer + stopper + iron nail

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