Acta Phys. -Chim. Sin. ›› 2001, Vol. 17 ›› Issue (03): 245-247.doi: 10.3866/PKU.WHXB20010312

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Thermochemical Studies on the LangbeiniteType Double Sulfate Salts，(NH4)2Cd2(SO4)3 and K2Cd2(SO4)3

Zhou Ya-Ping;Zhang Rui;Wan Hong-Wen;Zhan Zheng-Kun;Xu Ming-Fei   

  1. Department of Chemistry,Central China Normal University,Wuhan　430079
  • Received:2000-07-06 Revised:2000-10-30 Published:2001-03-15
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Abstract: The standard molar formation enthalpies of (A＋)2Cd2(SO4)3[A＋ is NH＋ 4 or K＋] are determined from the enthalpies of dissolution (ΔsHm) of [(A＋)2SO 4(s)＋2CdSO4(s)] and (A＋)2Cd2(SO4)3(s) in twice distilled water or 3 mol•L－1 HNO3 solvent respectively,at 298.2 K,as: ΔfHm [(NH4)2Cd2(SO4)3,s,298.2K]=－3031.74±0.08 kJ•mol－1 ΔfHm [K2Cd2(SO4)3,s,298.2K]=－3305.52±0.17 kJ•mol－1

Key words: Double sulfate salts, Solution calorimetry, The standard molar enth alpy of formation