Determination of Standard Molar Enthalpies of Formation for "White Powdery Tungstic Acid" and for Dodecatungstophosphoric Acid by Solution Calorimetry

Chemical Research in Chinese Universities ›› 1993, Vol. 9 ›› Issue (1): 13-17.

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Determination of Standard Molar Enthalpies of Formation for "White Powdery Tungstic Acid" and for Dodecatungstophosphoric Acid by Solution Calorimetry

WANG Ai-ming, CAI Xian-e, ZHU Jing, Gu Yi-dong

Department of Chemistry, Fudan University, Shanghai 200433

Received:1992-04-28 Online:1993-01-24 Published:2011-08-17

Abstract

Abstract: "White powdery tungstic acid" has been used for preparing various types of tungsten-containing compounds due to its high reactivity. The present paper covers the standard molar enthalpies of formation, △H_f⁰ of three tungsten- containing acids. The values found for "white powdery tungstic acid" WO₃·1.68H₂O, "yellow tungstic acid" WO₃·1.20H₂O and dodecatungstophosphoric acid H₃(PW₁₂O₄₀)·25H₂O at 298.15K were-(1312±1), -(1192±1) and -(18150±13) kJmol^-1, respectively.

Key words: Enthalpy of formation, Tungstic acid, Dodecatungstophosphoric acid, Solution calorimetry

WANG Ai-ming, CAI Xian-e, ZHU Jing, Gu Yi-dong. Determination of Standard Molar Enthalpies of Formation for "White Powdery Tungstic Acid" and for Dodecatungstophosphoric Acid by Solution Calorimetry[J]. Chemical Research in Chinese Universities, 1993, 9(1): 13-17.

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Determination of Standard Molar Enthalpies of Formation for "White Powdery Tungstic Acid" and for Dodecatungstophosphoric Acid by Solution Calorimetry

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