To find the relative atomic mass of a sample of Lithium.

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Chemistry Coursework                      Glen Musgrove                                      01/04/03

Aim

To find the relative atomic mass of a sample of Lithium

Safety

When carrying out this practical wear safety glasses at all times.

Where the rubber gloves at all times and make sure there are no holes or tears.

When filling the burette hold the funnel slightly above the rim so as to break the seal allowing air to leave and fluid to replace it instead of the funnel filling up.

The above helps to prevent you over filling the burette and it spilling over. Always fill the burette after moving it lower down so that if it does spill over it does not pour onto you or into your eyes.

Wash your hands thoroughly after handling any Acids or Bases.

Do not rub your eyes or put your hands or fingers in your mouth at any point during the experiment.

Do not sit at the desk as this may prevent you moving in the event of a spillage.

Lithium is a highly reactive element and must be treated with caution, it will react simply with the water that is in the air. This is why it is stored in oil to prevent it reacting. The problem with Lithium coming into contact with the skin is that it will react with the water in our skin and then form highly concentrated acids as well. This is why rubber gloves must be worn at all times.

HCl is a strong acid and must be treated carefully because contact with the skin could cause irritation and severe damage if it isn’t washed off.

If the skin does come into contact with either of theses then it must be washed thoroughly and immediately.

Equipment

>Safety glasses.

>Rubber Gloves.

>50 cm3 Burette.

>25 cm3 Pipette.

>Pipette filler.

>Water bowl.

>Conical flask.

>Boss clamp and Stand.

>White tile.

>Beakers.

>Small pipette.

>Distilled water dispenser

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>250cm3 Measuring cylinder.

>Delivery tube.

>Phenyl Phthalein.

Method 1

Carry out the method set out for the first Experiment being careful to follow the instructions carefully.

Using the following formula and the results I gain from titrating Lithium Oxide and Hydrochloric Acid I hope to find the relative  atomic mass of the LI sample.

Ma x Va    =   Mb x Vb

    Na                        Nb

Avogadro’s Number

Avagadro’s number is more commonly known as the mole. It is the number of C12  atoms in ...

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