Heats of Solution, Transition, and Formation of Three Crystalline Forms of Metaboric Acid

The three crystalline forms of metaboric acid HBO(2) were prepared, purified, and analyzed. Heats of solution in water or of reaction with sodium hydroxide solution were compared with those of orthoboric acid H(3)BO(3)(c). The best values for the heats of transition at 25 °C are: (c,I) to (c,II), 2....

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Detalles Bibliográficos
Autores principales: Kilday, Marthada V., Prosen, Edward J.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: [Gaithersburg, MD] : U.S. Dept. of Commerce, National Institute of Standards and Technology 1964
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5325167/
https://www.ncbi.nlm.nih.gov/pubmed/31834710
http://dx.doi.org/10.6028/jres.068A.012
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author Kilday, Marthada V.
Prosen, Edward J.
author_facet Kilday, Marthada V.
Prosen, Edward J.
author_sort Kilday, Marthada V.
collection PubMed
description The three crystalline forms of metaboric acid HBO(2) were prepared, purified, and analyzed. Heats of solution in water or of reaction with sodium hydroxide solution were compared with those of orthoboric acid H(3)BO(3)(c). The best values for the heats of transition at 25 °C are: (c,I) to (c,II), 2.33±0.23 kcal/mole; (c,II) to (c,III), 1.30±0.05 kcal/mole; (c,I) to (c,III), 3.63±0.24 kcal/mole. The following heats of formation at 25 °C were derived: −192.77 ± 0.35 kcal/mole for the cubic HBO(2)(c,I), −190.43 ±0.34 kcal/mole for the monoclinic HBO(2) (c,II), and −189.13 ± 0.34 kcal/mole for the orthorhombic HBO(2)(c,III).
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spelling pubmed-53251672019-12-10 Heats of Solution, Transition, and Formation of Three Crystalline Forms of Metaboric Acid Kilday, Marthada V. Prosen, Edward J. J Res Natl Bur Stand A Phys Chem Article The three crystalline forms of metaboric acid HBO(2) were prepared, purified, and analyzed. Heats of solution in water or of reaction with sodium hydroxide solution were compared with those of orthoboric acid H(3)BO(3)(c). The best values for the heats of transition at 25 °C are: (c,I) to (c,II), 2.33±0.23 kcal/mole; (c,II) to (c,III), 1.30±0.05 kcal/mole; (c,I) to (c,III), 3.63±0.24 kcal/mole. The following heats of formation at 25 °C were derived: −192.77 ± 0.35 kcal/mole for the cubic HBO(2)(c,I), −190.43 ±0.34 kcal/mole for the monoclinic HBO(2) (c,II), and −189.13 ± 0.34 kcal/mole for the orthorhombic HBO(2)(c,III). [Gaithersburg, MD] : U.S. Dept. of Commerce, National Institute of Standards and Technology 1964 1964-02-01 /pmc/articles/PMC5325167/ /pubmed/31834710 http://dx.doi.org/10.6028/jres.068A.012 Text en https://creativecommons.org/publicdomain/zero/1.0/ The Journal of Research of the National Bureau of Standards Section A is a publication of the U.S. Government. The papers are in the public domain and are not subject to copyright in the United States. Articles from J Res may contain photographs or illustrations copyrighted by other commercial organizations or individuals that may not be used without obtaining prior approval from the holder of the copyright.
spellingShingle Article
Kilday, Marthada V.
Prosen, Edward J.
Heats of Solution, Transition, and Formation of Three Crystalline Forms of Metaboric Acid
title Heats of Solution, Transition, and Formation of Three Crystalline Forms of Metaboric Acid
title_full Heats of Solution, Transition, and Formation of Three Crystalline Forms of Metaboric Acid
title_fullStr Heats of Solution, Transition, and Formation of Three Crystalline Forms of Metaboric Acid
title_full_unstemmed Heats of Solution, Transition, and Formation of Three Crystalline Forms of Metaboric Acid
title_short Heats of Solution, Transition, and Formation of Three Crystalline Forms of Metaboric Acid
title_sort heats of solution, transition, and formation of three crystalline forms of metaboric acid
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5325167/
https://www.ncbi.nlm.nih.gov/pubmed/31834710
http://dx.doi.org/10.6028/jres.068A.012
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