The aim of this investigation is to determine the relative atomic mass of Lithium by two different methods:

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        The aim of this investigation is to determine the relative atomic mass of Lithium by two different methods:

 By measuring the volume of Hydrogen produced when Lithium is dissolved in water;

 And by titrating the Lithium Hydroxide produced.

As a basic safety measure, goggles should be worn during the entire experiment and titration.

It is important not to handle the Lithium with your bare hands. Lithium reacts violently with water, which may be present on your hands. When Lithium reacts with water it forms Lithium Hydroxide (LiOH) solution, which is corrosive – this means it can cause burns. You should transport the Lithium using tongs or by placing it inside a dry container.

It is important not to spill the Hydrochloric Acid when handling it as it also corrosive and can cause burns. The vapour is very irritating to the respiratory system.

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Results

During the first reaction, I found that 160ml of Hydrogen was produced when placing exactly 0.1g of Lithium in 100cm³ of distilled water.

During the titration, I collected these results:

The average result that I will be using in the calculations is 32.25ml.

Calculations – first reaction

        

I will aim to;

  1. Calculate the number of moles of Hydrogen.
  2. Deduce the number of moles of Lithium.
  3. Calculate the relative atomic mass of Lithium.

i)                          1 mole ...

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