Enthalpy-Concentration Charts for NH<SUB>4</SUB>Br-NH<SUB>3</SUB> and HN<SUB>4</SUB>I-NH<SUB>3</SUB> Systems

DOI Web Site Web Site Open Access

Bibliographic Information

Other Title
  • ＮＨ４Ｂｒ‐ＮＨ３およびＮＨ４Ｉ‐ＮＨ３系のエンタルピー‐濃度線図
  • NH4Br NH3 オヨビ NH4I NH3ケイ ノ エンタルピー ノウド セ

Search this article

Description

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%.

Journal

Keywords

Details 詳細情報について

Report a problem

Back to top