Kinetic Studies on the Decolorization Reaction of Rosaniline in Aqueous Acidic Medium

• Sudhir K Sinha

  Department of Chemistry, Indian Institute of Technology

• Sarvagya S Katiyar

  Department of Chemistry, Indian Institute of Technology

抄録

The reaction responsible for the decolorization of rosaniline in acid medium has been studied spectrophotometrically. The rate-determining step has been found to be the reaction of the protonated dye cation with water molecule. Kinetic data have been analyzed on the basis of rate equations which were derived considering the complete protolytic scheme involving all the steps of the reaction of rosaniline in acid and alkaline media. The rate constant k1 for the ion-molecule reaction has been found to be independent of the dye concentration and hydrogen ion concentration. The apparent rate constant k at various hydrogen ion concentrations has been utilized for calculating the equilibrium constant for the fast protonation step. Effect of ionic strength in the range 0–0.27 indicates no substantial effect on the rate constant k1. Anomalous solvent effects were obtained suggesting the solvated nature of the reactants. The average energy of activation for the reaction of rosaniline in aqueous medium corresponded to 10.52 kcal. Chemical and kinetic evidence has been presented to prove the participation of water molecule in the rate-determining step.

収録刊行物

• Bulletin of the Chemical Society of Japan

  Bulletin of the Chemical Society of Japan 50 (2), 507-513, 1977-02-01

  Oxford University Press (OUP)

キーワード

• General Chemistry

詳細情報

• CRID: 1360565169054253824
• NII論文ID: 130001970855
• DOI: 10.1246/bcsj.50.507
• ISSN: 13480634
• ISSN: 00092673
• Web Site: https://academic.oup.com/bcsj/article-pdf/50/2/507/56093549/bcsj.50.507.pdf
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