Kinetics Study of the Reaction of Bromine with Phenylhydrazine in Sulfuric Acid Media

페닐히드라진과 브롬의 반응메카니즘에 관한 연구

  • Park Byoung Bin (Department of Chemistry, Sung-Gyun-Gwan University) ;
  • Park Il H. (Department of Chemistry, Sung-Gyun-Gwan University) ;
  • Kong Young Kun (Department of Chemistry, Won Kwang University) ;
  • Choi Q. Won (Department of Chemistry, Won Kwang University)
  • Published : 1977.08.30


The reaction of phenylhydrazine with bromine in sulfuric acid solution has been studied kinetically. The pseudo-second-order rate constant is approximately inversely proportional to hydrogen-ion concentration when the concentration of sulfuric acid is lower than 1M. arom the study of the effect of potassium bromide concentration on the rate constant, it is concluded that both neutral bromine and tribromide ion participate in the reaction, the rate constants in 0.01M $H_2SO_4$ being $5{\times}10^5M^{-1},sec^{-1}\;and\;0. 7{\times}10^5M^{-1},sec^{-1}$, respectively at $20^{\circ}C$. The pseudo-second-order rate constant of 2.4-dinitrophenylhydrazine-bromine reaction is independent of hydrogen ion concentration. From the KBr addition experiment, the rate constants for $Br_2\;and\;Br_3^-$ were obtained as $1.2{\times}10^5M^{-1},sec^{-1}\;and\;2.0{\times}10^4M^{-1},sec^{-1}$, respectively.



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