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化学学报
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化学学报 ›› 1955, Vol. 21 ›› Issue (3): 320-327. 上一篇    下一篇

论文

重铬酸钾在25°的溶解度与轻水重水混合物组成的关系

张青莲, 张榕森   

  1. 北京大学化学系
  • 投稿日期:1955-06-20 发布日期:2013-06-04

DEPENDENCE OF THE SOLUBILITY OF POTASSIUM DICHROMATE ON THE COMPOSITION OF THE MIXTURE OF LIGHT AND HEAVY WATER AT 25

CHANG TSING-LIEN, CHANG YUNG-SEN   

  1. Department of Chemistry,Peking University
  • Received:1955-06-20 Published:2013-06-04

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我們在25±0.03°測定了重鉻酸鉀於輕水-重水混合物中的溶解度,由此得到下列經驗式:Sn=0.5024-0.1467n+0.0174n～2 Sx=0.1478-0.0540x+0.0049x～2 式中Sn表示每55.51克分子含n克分子分數D2O的輕水-重水混合物中所溶K2Cr2O7的克分子數;Sx表示每克含x重量分數D2O的輕水-重水混合物中所溶K2Cr2O7的克數.實驗誤差約±0.25%.由式得出:Sn～(D2O)=0.3731;Sx～(D2O)=0.0987.重鉻酸鉀在25°的溶解度舆重水濃度間所呈現的這種非直線性關係,表明了第二個D原子代入水分子中時所產生的效應只有第一個D原子代入作用的76%.從這兩個經驗式可以計算出重鉻酸鉀在25°時在HDO中的溶解度:Sn～(HDO)=0.4291;Sx～(HDO)=0.1208.

The solubilities of potassium dichromate in mixtures of light and heavy water with various D2O-contents hsve been measured at 25±0.030.The solubility is expressed in two different ways:(1) Sn,the number of moles of K2Cr2O7 dissolving in 55.51 moles of H2O-D2O mixture with the mole fraction of D2O equalton;(2) Sx,the number of grams of K2Cr2O7 dissolving in 1 gram of H2O-D2O mixture with the weight fraction of D20 equal to x(see Table 1, pp.321-322).