Determination of free acid in ferric chloride solution (reivestigation of JIS K 1447).

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  • SAHARA Masanobu
    Department of Industrial Chemistry, Kumamoto Institute of Technology
  • YOSHIMURA Hirotoshi
    Department of Industrial Chemistry, Kumamoto Institute of Technology
  • SAGARA Fumio
    Department of Industrial Chemistry, Kumamoto Institute of Technology
  • UFAO Keihei
    Department of Industrial Chemistry, Kumamoto Institute of Technology
  • YOSHIDA Isao
    Department of Industrial Chemistry, Kumamoto Institute of Technology
  • ISHII Daido
    Department of Industrial Chemistry, Kumamoto Institute of Technology

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Other Title
  • 塩化第二鉄水溶液中の遊離塩酸の定量法について（ＪＩＳ　Ｋ　１４４７の再検討）
  • エンカ ダイ 2 テツ スイヨウエキチュウ ノ ユウリ エンサン ノ テイリョ

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Abstract

Acidic ferric chloride solution is widely used as an etching solution for processing the copper coated printed circuits. Determination of free acid (HG!) in ferric chloride solu tion according to the JIS K 1447 method often results in a large negative errors. Principle of the JIS method involves the preliminary separation of ferric ion as K3FeF3 by adding a neutralized potassium fluoride solution, followed by the alkalimetry on an aliquot of the filtrate. However, it was found that hydrofluoric acid which results in the mixture after the addition of potassium fluoride, reacts with glass-ware with the consumption of proton, thus giving negative errors. Accordingly, all glass-wares which come in contact with acidic potassium fluoride solution, have been replaced with polypropyrene laboratory wares. The analytical results obtained under this condition was in good agreement with the calculated values.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 41 (3), T45-T47, 1992

    The Japan Society for Analytical Chemistry

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