Ion-Pair Extraction of Boron Complex Anions (Ⅱ). Effect of Fluoride and Bifluoride Ions

붕소 착물 음이온의 이온쌍 추출 (제2보). $F^-$$HF_2^-$-이온의 영향

  • 송형수 (고려대학교 이과대학 화학과) ;
  • 김해동 (고려대학교 이과대학 화학과) ;
  • 김강진 (고려대학교 이과대학 화학과)
  • Published : 1983.12.20


The effects of existing anions in hydrofluoric acid solutions, $F^-$ and $HF_2$on the extraction of methylene blue-$BF_4^-$ ion-pair into 1,2-dichloroethane have been investigated by spectrophotometry. The absorbance of the extracted ion-pair is found to be independent of $F^-$ion up to $10^{-2}$ molar concentration, which implies that $F^-$ion dose not directly interfere with the extraction. However, $HF_2^-$ ion competes with $BF_4^-$ion for methylene blue and the extraction constant for methylene blue-H$F_2$ion-pair is calculated to be 8.5 at $25^{\circ}C$.



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