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Determination of the standard enthalpy of formation of paratungstate A ion

✍ Scribed by Shijun Liu; Qiyuan Chen; Pingmin Zhang

Publisher: Elsevier Science
Year: 2001
Tongue: English
Weight: 110 KB
Volume: 33
Category: Article
ISSN: 0021-9614
DOI: 10.1006/jcht.2000.0719

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✦ Synopsis

Enthalpy changes for the reaction of HCl(aq) with Na 2 WO 4 (aq) were measured at T = 298.15 K in a HT-1000 calorimeter. The standard enthalpy of reaction for the formation of W 7 O 6- 24 (aq) was calculated on the basis of the experimental results, r H o m (298.15 K) = -(320.7 ± 1.0) kJ • mol -1 . Combining this with the values from the literature led to the standard enthalpy of formation of W 7 O 6- 24 (aq), f H o m (298.15 K) = -6689.8 kJ • mol -1 .

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