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Determination of the amount of water present in copper sulfate hydrate

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Introduction

Aim: The Aim of this experment is to determine the amount of water present in a sample of copper sulfate. The amount of water present that obtained from this experment is used to predict the formula the hydrated copper sulfate. Raw data: Quantitative data: Measurements Mass (gram) First Second Third Mass of the test tube 19.0 19.0 19.0 Mass of the test tube + hydrated salt 19.6 19.8 20.1 Mass of the test tube + anhydrated salt 19.4 19.6 19.1 Qualitative data: * The colour has change from light blue to light grey. * The test tube went darker. * There was water which evaporate from the sample of copper sulfate. ...read more.

Middle

= 0.6 - 0.4 = 0.2 g Mole of CuSO4 = mass of CuSO4 / molar mass of CuSO4 = 0.4 g / 159.61 g/mol = 0.0025 mol Mole of H2O = mass of H2O / molar mass of H2O = 0.2 g / 18.01 g/mol = 0.0111 mol Mole ratio = mole CuSO4: mole H2O = 0.0025 : 0.0111 = 1 : 4 Therefor the value of x is 4 and the formula of copper sulfate hydrate is CuSO4. 4H2O Concluison: Copper to sulfate usually found on hydrate form, because it absorbs water easliy. The copper sulfate and water absorbed forming a weak bond, so the water could be released easily when this compound is heated. ...read more.

Conclusion

"Copper(II) Sulfate." Wikipedia, the Free Encyclopedia. 8 Sept. 2011. Web. 12 Sept. 2011. <http://en.wikipedia.org/wiki/Copper(II)_sulfate>. Evaluation: The method in this experiment can be used to determine the amount of water present in a sample that forming weak bond with a number of water molecules. The data obtain from the experiment could be different because the sample is highly hygroscopisch. The determination process that use this method should be repeated to get more accurate data. The data from the third measurement is far different rather then the data obtained from the first and second one it could be happend because of the uncertainty that mention above. The heating process is could be not constant because we use the bunsen burner that its temperature can not be control. ...read more.

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