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Determination of the Relative Atomic Mass of Calcium
Member rating: No Rating | Words: | Submitted: Mon Aug 18 2003
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Determination of the Relative Atomic Mass of Calcium In this experiment, I will determine the relative atomic mass of calcium by two different methods. * By measuring the volume of hydrogen produced. * By titrating the lithium hydroxide produced. Method 1 * 0.10g of calcium used. * 100cm3 of distilled water used. Results Method 1 Mass of Calcium (g) Total volume of gas produced (cm3) 0.10 37 * Starting point of water in cylinder = 238cm3 * Ending point, after reaction complete, of water in cylinder= 201cm3 * (238 - 201 = 37) Deduction of 37cm3, therefore 37cm3 of hydrogen gas produced. 1 mol of gas occupies 24000 cm3 at room temperature and pressure. Ca (s) + 2H2O (l) --> Ca(OH)2 (aq) + H2 (g) * Number of moles of hydrogen = volume of hydrogen / 24000 = 37/24000 = 0.0015416 mol = 0.001542 mol (4sf) * Number of moles of calcium = 0.001542 (ratio 1:1 with hydrogen) * Relative...
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