ＮＨ４Ｂｒ‐ＮＨ３およびＮＨ４Ｉ‐ＮＨ３系のエンタルピー‐濃度線図

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タイトル別名
  • Enthalpy-Concentration Charts for NH<SUB>4</SUB>Br-NH<SUB>3</SUB> and HN<SUB>4</SUB>I-NH<SUB>3</SUB> Systems
  • NH4Br NH3 オヨビ NH4I NH3ケイ ノ エンタルピー ノウド セ

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The specific heats and the differential heats of solution for NH4Br-NH3 and NH4I-NH3 systems were measured in order to construct enthalpy-concentration charts for these systems.<BR>A twin calorimeter was used. Specific heat measurements were carried out at concentrations of ammonium bromide or ammonium iodide from 0 to 70 wt% and temperatures from 10 to 50°C. Differential heats of solution were measured over a concentration range from 0 to 70 wt% at 25°C. Integral heats of mixing were calculated from the differential heats of solution observed in this work and the differential heats of dilution estimated from the activities of these solution systems.<BR>The accuracy of the twin calorimeter was examined by measuring the heat of solution of tris (hydroxymethyl) aminomethane (THAM) in 0.1 N HCl (aq.) and 0.1 N NaOH (aq.) at 25°C The maximum deviation from literature data was within 3%.

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