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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 19, Number 5
JKCSEZ 19(5)
October 20, 1975 

Kinetics of N2H4-I2 Reaction in Sulfuric Acid Media

황산 산성용액중에서의 N2H4-I2 반응의 속도론적 연구
Q. Won Choi, Chuhyun Choe, Wonki Choi, Soonki Rhee

최규원, 최주현, 최원기, 이순기
요오드와 히드라진 사이의 반응을 요오드의 소비속도와 기체발생 속도를 비교하는 방법으로 검토하였다. 낮은 pH에서는 요오드의 소비속도가 율속단계이나 중성 및 약한 산성에서는 기체발생 속도가 율속과정이다. 요오드 소비속도가 기체 발생속도의 1000배쯤 된다. 이들 사실을 실명하기 위하여 중간몰(아마 N2H2I2)이 생성되어 그 분해속도 상수가 중성에서 약 1.5×10-3sec-1쯤 된다는 가정을 제시하였다.

The rates of consumption of iodine and gas evolution in hydrazine-iodine reaction in the presence of large excess of hydrazine have been studied in the pH range 0.5∼7. They are the same at very low pH and both increase to respective asymptotic values as pH is increased. The rate of iodine consumption is three orders of magnitude faster than the rate of gas evolution at higher pH. The results are explained by postulating that N2H4 but not protonated form reacts with iodine and an intermediate, probably N2H2I2, is formed which decomposed by first order reaction of rate constant about 1.5×10-3 sec-1 in neutral and weakly acidic solutions.

339 - 342
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