University Chemistry ›› 2021, Vol. 36 ›› Issue (2): 1912074.doi: 10.3866/PKU.DXHX201912074

• Chemistry Laboratory • Previous Articles     Next Articles

Study on the Colour Reaction System of Iodine and Water-Soluble Polymer

Hongyu Liu1,*(), Sihao Yuan3, Gu Jin2   

  1. 1 National Demonstration Center for Experimental Chemistry Education(University of Science and Technology of China), Hefei 230026, China
    2 School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026, China
    3 School of the Gifted Young, University of Science and Technology of China, Hefei 230026, China
  • Received:2019-12-30 Accepted:2020-01-09 Published:2020-02-28
  • Contact: Hongyu Liu E-mail:liuhyhx@ustc.edu.cn

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Abstract:

This paper introduces a comprehensive inquiry experiment. Two water-soluble polymers, starch and polyvinyl alcohol (PVA), were selected to form a color developing system with iodine. By spectrophotometry, the effects of different reaction conditions, such as pH, reaction temperature, concentration of reactants and reaction time, on the color rendering results were investigated, and the optimum reaction conditions were determined. The working curve of absorbance was constructed and the application of the color rendering system was discussed. Rationality of quantitative measurement of substances.

Key words: Color reaction, Iodine, Starch, PVA, Quantitative analysis