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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 21, Number 4
JKCSEZ 21(4)
August 20, 1977 

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

페닐히드라진과 브롬의 반응메카니즘에 관한 연구
Byoung Bin Park, Il H. Park, Young Kun Kong, Q. Won Choi

박병빈, 박일현, 공영건, 최규언
황산산성에서 페닐히드라진과 브롬의 반응을 속도론적으로 검토하였다. 겉보기 2차 반응속도상수는 1M 이하의 황산농도에서는 수소이온 농도에 대략 역비례한다. KBr 첨가의 영향을 검토하여 Br2 및 Br3-가 반응화학종이고, 이들의 속도상수는 20℃의 0.01M H2SO4용액에서 각각 5 × 105M-1·sec-1 및 0. 7 × 105M-1·sec-1임을 밝혔다. 2,4-디니트로 페닐히드라진의 브롬과의 반응속도상수는 수소이온 농도에 거의 무관계하며 Br2 및 Br3-에 대하여 각각 1.2 × 105M-1·sec-1 및 2.0 × 104M-1·sec-1이다.

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 H2SO4 being 5 × 105M-1·sec-1 and 0. 7 × 105M-1·sec-1, respectively at 20℃. 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 Br2 and Br3- were obtained as 1.2 × 105M-1·sec-1 and 2.0 × 104M-1·sec-1, respectively.

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