无水钾镁矾类复盐 (A＋ )2Cd2(SO4)3的热化学

摘要

The standard molar formation enthalpies of (A＋ )2Cd2(SO4)3[A＋ is NH＋ 4 or K＋ ] are determined from the enthalpies of dissolution (Δ SHm) of [(A＋ )2SO4(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: rnΔ fH m[(NH4)2Cd2(SO4)3,s,298.2K]=－ 3031.74± 0.08 kJ· mol－ 1 rnΔ fH m[K2Cd2(SO4)3,s,298.2K]=－ 3305.52± 0.17 kJ· mol－ 1