中和滴定指示薬の選択に関する実験的検討

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  • Experimental Study on the Selection of Indicator for the Neutralization Titration
  • チュウワ テキテイ シジヤク ノ センタク ニ カンスル ジッケンテキ ケントウ

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The measurements of the titration curves were carried out on the several rieutrailzation titrations, and a large number of experimental data of titration obtained under the various conditions were statistically analyzed.　When the concentration of the solutions is 0.1N, almost accurate results are obtained by the use of suitable idicator. However, in the case of more dilute solutions, it is difficult to obtain a proper result because of a slow change of pH at the equivalent point and of the influence of carbon dioxide in the atmosphere.　It was found that the mixed indicator of methyl red and methylene blue is very suitable for the titration between strong acid and base.

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