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Determination of the relative atomic mass of lithium.
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Determination of the relative atomic mass of lithium Introduction In this experiment I will determine the relative atomic mass of lithium by two different methods: * By measuring the volume of hydrogen produced * By titrating the lithium hydroxide produced Results: METHOD 1 Assume that 1 mole of gas occupies 24000cm3 at r.p.t. 2Li(s) + 2H2O(l) LiOH(aq) + H2(g) Calculating the Ar of Lithium To find the moles of Lithium (Li) we must first find the moles of Hydrogen (H2) by using the formula: Moles = volume 24000cm3 Moles = 206cm3 24000cm3 Moles = 8.583 x 10-3 Now that we can determine the moles of Lithium (Li) by using the ratio between them: Ratio = Li : H2 2 : 1 ?Moles of Lithium = 2 x (8.583 x 10-3) = 0.017166666666 Now that we know the number of moles of Lithium we can determine its relative atomic mass (Ar). Moles = mass Ar Ar = 0.11 0.01716666666 Ar = 6.40776699g Ar = 6.4g Ionic Equation Li+(aq) + OH-(aq) +...
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