酢酸および無水酢酸中の硫酸の定量

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タイトル別名
  • Determination of sulfuric acid in an acetic acid medium
  • サクサン オヨビ ムスイ サクサン チュウ ノ リュウサン ノ テイリョウ

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説明

A rapid method for the determination of sulfuric acid present in an acetylating mixture is described. A 0.1M solution of lead acetate or barium acetate in acetic acid, with crystal violet as indicator, was used to titrate the sulfuric acid in a mixture of acetic acid and acetic anhydride. It was found that the blue color of the indicator sharply turned to violet at the end. point which coincided with that obtained by the potentiometric method. The amount of acetic anhydride in the acetylating bath could also be determined according to Ellerington's non-aqueous titration method (Analyst, 82, 233, 1957). (A correction for sulfuric acid as necessary, however.)<BR>It was possible to determine the amount of residual free sulfuric acid in the acetylating bath after the saponification of cellulose triacetate. The presence of cellulose did not interfere.

収録刊行物

  • 分析化学

    分析化学 8 (2), 103-106, 1959

    公益社団法人 日本分析化学会

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