Acta Phys. -Chim. Sin. ›› 1989, Vol. 5 ›› Issue (05): 590-593.doi: 10.3866/PKU.WHXB19890516

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THE DETERMINATION OF STANDARD ELECTROMOTIVE FORCE OF CELL Cu|CuSO4|Hg2SO4-Hg AT DIFFERENT TEMPERATURES

Cheng Zhihua*; Li Han; Zhang Litian; Yang Jiazhen; Liang Chunyu   

  1. Changchun Institute of Applied Chemistry; Academia Sinica; Department of Chemistry; LiaoNing Universty; Shenyang
  • Received:1987-11-30 Revised:1988-08-31 Published:1989-10-15
  • Contact: Cheng Zhihua

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Abstract: The emfs of Cu|CuSO_4|Hg_2SO_4-Hg were determined at 5 temperature points from 278.15 K to 313.15 K. Based on the Pitzer' s Equation a polynomial approximation for the determination of standard emf, E_m, was proposed. The values of E_m obtained by author's method agree with values of E_m obtained by the extended Debye-Huckel equation within experimental errors. Compared with the extrapolation result of extended Debye-Huckel equation, the uncertainty by the selecting of parameter of ion size was avoided. By the use of polynomial approximation method the standard emf's for different type cells in the literature were also determinded. The results were more satisfactary.