The Reduction Potential of Pentavalent Vanadium to Vanadyl Ion in Hydrochloric Acid Solutions. Fluoresenzversuch AnOrganische Daempfe, Besonders Aceton. Studies of the Nature and Reactions of Oxidized Silver Compounds, Especially in Nitric Acid (Book, 1935) [WorldCat.org]
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The Reduction Potential of Pentavalent Vanadium to Vanadyl Ion in Hydrochloric Acid Solutions. Fluoresenzversuch AnOrganische Daempfe, Besonders Aceton. Studies of the Nature and Reactions of Oxidized Silver Compounds, Especially in Nitric Acid Preview this item
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The Reduction Potential of Pentavalent Vanadium to Vanadyl Ion in Hydrochloric Acid Solutions. Fluoresenzversuch AnOrganische Daempfe, Besonders Aceton. Studies of the Nature and Reactions of Oxidized Silver Compounds, Especially in Nitric Acid

Author: Charles Dubois Coryell
Publisher: 1935
Dissertation: Thesis / Dissertation ETD
Edition/Format:   Thesis/dissertation : Thesis/dissertation : English
Summary:
<p>I:<br /> A series of measurements of the electromotive force of half-cells made up of solutions of V<sub>2</sub>O<sub>5</sub> and VOCl<sub>2</sub> in excess HCl against calomel half cells in HCl of the same strength,for which there were negligible liquid junctions, is presented. The acid concentration was varied from 0.01012 to 2.146 M. The observed potentials were  Read more...
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Details

Genre/Form: Thesis
NonPeerReviewed
Material Type: Thesis/dissertation
Document Type: Book
All Authors / Contributors: Charles Dubois Coryell
OCLC Number: 718751079
Language Note: English
Notes: application/pdf

Abstract:

<p>I:<br /> A series of measurements of the electromotive force of half-cells made up of solutions of V<sub>2</sub>O<sub>5</sub> and VOCl<sub>2</sub> in excess HCl against calomel half cells in HCl of the same strength,for which there were negligible liquid junctions, is presented. The acid concentration was varied from 0.01012 to 2.146 M. The observed potentials were corrected for calomel cell and for other concentrations as per the following assumed reaction:<br /> VO<sup>++</sup> + 2 H<sub>2</sub>O == HVO<sub>3</sub> + 3 H<sup>+</sup> E<sup>-</sup>.<br /> Values of E<sub>0</sub> so obtained decreased with decreasing acid concentration. This decrease was correlated with complex formation ( V(OH)<sup>+</sup><sub>4</sub>, etc.) noted in increased solubility of freshly precipitated HVO<sub>3</sub> in HCl as measured. The potential in molal HCl is -1.0216 Volts, corresponding to a free energy decrease of +23,572 cal. when 1/2 H<sub>2</sub> reduces a pentavalent atom of vanadium (irrespective of nature) in 1.00 M HC1. From the temperature coefficient of the cell, the heat content increase for the same reaction was found to be -29,350 cal.</p> <p>II:<br /> Experiments carried out in the Physico-chemical Institute of the Technische Hochschule München in searching for a discrete fluorescence spectrum of acetone vapor are given. A detailed description of the apparatus for studying flowing gases at various pressures is included, as well as a study of benzene fluorescence which was used to standardize technique and test the sensitivity of the methods. Long illuminations of acetone vapor at various pressures with powerful Al sparks gave no fluorescence, although the line 1862 Å was absorbed. A mercury arc produced in short time three continua in the visible, two of which were already known, but no line spectrum. Conditions were found with Tesla excitation in which output of light was good but little CO was formed in decomposition. Nine hours exposure yielded only the continua

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