Microscale Experiments on Determining Densities of Ethanol Aqueous Solutions

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  • エタノールスイヨウエキノミツドソクテイニカンスルマイクロスケールジッケン
  • エタノール水溶液の密度測定に関するマイクロスケール実験

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Abstract

type:P(論文)

Nine ethanol aqueous solutions(10.0-90.0 mass ％ of ethanol at intervals of 10.0 mass ％）have been prepared and their densities have been determined at room temperature using microscale experiments. An electronic balance and 5mL graduated cylinders have been used as equipment. Observed densities of these solutions are in agreement with reference data. In this procedure, the least amount of ethanol aqueous solutions is ca. 1.2mL and it takes ca. 2minutes to measure the mass and volume of each solution. That is, both the amount of reagents and the experiment time are reduced in comparison with the traditional experiment. Moreover, using our density data, molarities and excess molar volumes are estimated over the whole concentration range, and they are both satisfactory. Therefore, it has been found that our methods of determining densities of ethanol aqueous solutions are useful and informative as teaching materials for high school science and university chemistry.

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