Determining the relative atomic mass of lithium.

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Before I started my coursework I wrote a risk assessment which covered all the risks and hazards that might take place during the practical and how to avoid them. I know that lithium is a corrosive chemical and reacts vigorously with water to produce lithium hydroxide which is highly flammable. I made a list of all the chemicals and procedures that would take place during the experiment and which of them might affect my final result. To avoid hazards from taking place I wore eye protection at all times. I also wore a lab coat to protect any acid from spilling on my clothes.

I did the experiment in 2 different parts. In the first one I produced lithium hydroxide. In the second one I did the titration of lithium hydroxide. From the first experiment, I reacted 0.09g of lithium with 100 cm³ of distilled water to produce lithium hydroxide. As a result I collected 134 cm³ of hydrogen gas. The table below shows the results produced for the second experiment that was the titration experiment.

From the titration results, I worked out an average of 27.0 cm³ (3 sig. fig).

I used appropriate equipment so that I can get accurate final results, as the precision of apparatus used would have an effect on all my measurements. I used a burette which gives the readings to the nearest 0.1 cm³ and reduces the chances of an error. It also helped me to record my titration results to the nearest 0.1 cm³. I used a balance scale to weigh the piece of lithium used which is an accurate equipment and measures to the nearest 0.01g. Hence, the overall accuracy of my equipment would help to produce an accurate final result for my experiment.

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From the results table I can see that I got concordance results that is the results that I got were quite close to each other. With the help of the results that I got in experiment 1 and experiment 2, I will now calculate the relative atomic mass of lithium.

However, before I calculate the relative atomic mass of lithium, I would define the terms that would be used the formulae.

The mole (n) of any substance is the amount which contains the ...

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