水-アルコール類混合溶液中の酸度

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タイトル別名
  • Acidity in water-alcohol mixtures
  • スイ-アルコールルイ コンゴウ ヨウエキ チュウ ノ サンド
  • 混合溶媒中の酸-塩基指示薬の動向(第4報)

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抄録

Absorption spectra of D. Y. and B. C. G. were measured in various methanol-water mixtures containing a definite volume of acid or base, and absorbances of its absorption spectra were plotted against methanol volume %. The lines came down with methanol concentration, but a minimum point appeared in every case at about 90% and the lines went up again with much increasing methanol concentration.<BR>The similar behaviour also appeared in mixture with ethanol or iso-propanol in place of methanol.<BR>The term, log [(BH+)/(B)], represented as H* in this report, is in proportion to the proton activity. H* values were calculated from absorption spectra and plotted against organic solvent concentrations.<BR>Then, observed pH values and activity coefficients of hydrogen ion were calculated from these H* values in methanol-water mixtures.<BR>For instance, activity coefficients in the solution of 0.012 N sulfuric acid were as follows; 1.00(methanol 10%), 0.39(30%), 0.13(50%), 0.04(70%), 0.03(90%) and 0.12(100%).

収録刊行物

  • 分析化学

    分析化学 15 (8), 811-816, 1966

    公益社団法人 日本分析化学会

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