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Factors influencing Kinetics between potassium peroxodisulphate and potassium iodide by Iodometry

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Author Affiliations

  • 1School of Studies in Chemistry and Biochemistry, Vikram University, Ujjain-456010, MP, India
  • 2School of Studies in Chemistry and Biochemistry, Vikram University, Ujjain-456010, MP, India
  • 3School of Studies in Chemistry and Biochemistry, Vikram University, Ujjain-456010, MP, India
  • 4School of Studies in Chemistry and Biochemistry, Vikram University, Ujjain-456010, MP, India
  • 5School of Studies in Chemistry and Biochemistry, Vikram University, Ujjain-456010, MP, India

Res.J.chem.sci., Volume 8, Issue (10), Pages 6-12, October,18 (2018)

Abstract

Potasssium peroxodisulphate (1) and potassium iodide (2) in a definite concentration mixed together, directly and with taking different catalyst e.g. ferrous sulphate, ferric chloride, sodium sulphate, mercuric acetate and arsenic oxide and rate of reaction is determined by Ostwald isolation method, iodometrically. By varying concentration of (1) and other constant, and vice versa, results suggested that rate of reaction second order; first order with respect to (1) and first order with respect to (2). There is no effect on rate of reaction by adding sodium sulphate, potassium perchlorate while adding mercuric acetate, as increase its concentration, rate of reaction decreases, hence it acts as scavenger. Effect of acids, temperature and addition of compounds on rate of reaction between (1) and (2) has been also studied. Results suggested from experiments that rate of reaction are independent on taking different initial concentration of sulphuric acid as well as perchloric acid. Effect of ferrous sulphate also studied between substrate and oxidant in the presence of sulphuric acid and arsenic oxide (low conc.) and observed that ferrous sulphate acts as inductor, hence the rate of reaction increases as concentration of ferrous sulphate increases. At higher concentration of arsenic trioxide efficacy of inductor is less and As2O3 acts as deductor. Arsenic and mercuric salts and sulphate salts cause pollution and affect green environment, directly or indirectly to human health and when related to kinetics As2O3 acts as deductor while mercuric acetate act as scavenger.

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