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Determination of the relative atomic mass of Lithium.
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Chemistry Coursework Determination of the relative atomic mass of Lithium In this experiment I am going to determine the relative atomic mass of lithium using two different methods, which are: * Measuring the volume of hydrogen produced * Titrating the lithium hydroxide produced Lithium is a group 1 alkaline metal. Method 1 - Procedure * Set up the apparatus as shown. The 250cm³ conical flask contains exactly 100.0cm³ of distilled water. * Weigh about 0.10g of lithium. Record the exact mass of lithium using an appropriate format. * Remove the stopper, add lithium and quickly replace the stopper. * Collect the gas evolved. Record the final volume. * Keep the solution in the conical flask form method 2. Results - I mole of gas occupies 24 000cm³ at room temperature and pressure. 2Li(s) + 2H O(l) 2LiOH(aq) + H (g) ² ² Lithium - 0.130g Gas collected (hydrogen) - 186cm³ Convert 186cm³ into dm³ = 186/1000 = 0.186dm³ Number of moles of hydrogen = Mass/Ar...
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