On the use of hypohalogenites in volumetric analysis. I. The hypobromite

Tomíček, O.; Jašek, M.

doi:10.1135/cccc19380353

Cited by 12 publications

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“…The decomposition of hypobromite and bromite to brómate and increase of brómate contents, with time, initially present in hypobromite solution at four selected alkali concentrations of 0.25 7, 0.4 , 0.5 7, and 0.8 7 was studied and it was found that hypobromite slowly decomposed to bromite which in turn changed to brómate. The alkali concentration had not appreciable stabilizing effect; the hypobromite solution had maximum stability between 0.4 7 to 0.5 7 alkali concentration (24,25). The rate of decomposition of solutions having minimum and maximum alkali concentration was comparable.…”

Section: Resultsmentioning

confidence: 98%

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Stability of Hypobromite and Hypoiodite Reagents.

Hashmi¹,

Ayaz²,

Rashid³

et al. 1964

Anal. Chem.

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Section: Resultsmentioning

confidence: 98%

“…Hypobromite solution prepared by mixing bromine and appropriate amount of sodium hydroxide was found to contain small amount of bromite and brómate in addition to hypobromite (24,25). The chemical reactions that take place are as follows:…”

Section: Resultsmentioning

confidence: 99%

Stability of Hypobromite and Hypoiodite Reagents.

Hashmi¹,

Ayaz²,

Rashid³

et al. 1964

Anal. Chem.

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“…Tomi6ek et al [12,13] tested possibilities of application of hypochlorites and hypobromites in direct potentiometric titrations and studied the course of oxidation-reduction reactions during the titration. They also pointed out that a certain amount of bromate (giving different oxidation-reduction reactions than hypobromite) may be formed in solutions of hypobromite, and that this may be the source of errors in stoichiometric calculations of the titrate concentration.…”

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confidence: 99%

Enthalpimetric determinations with sodium hypobromit

Malingerova¹,

Malinger²

1978

Journal of Thermal Analysis

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The applicability of sodium hypobromite as a reagent in enthalpimetric determinations of various organic and inorganic compounds is reviewed. Using this method it is possible to determine various oxidizable nitrogen and sulphur compounds, e.g. ammonium salts, urea, c~-amino acids, sulphides, sulphites, thiosulphates, organic compounds with sulphidic sulphur, aromatic amines, mono-and polyphenols, and other compounds. Determinations are sufficiently precise and sensitive. The enthalpy changes of these reactions are approximately 10 z to 10 z kJ mole -1. Suggested determinations are advantageous due to their simplicity, quickness and possible automatization of measurements.Solutions of alkali metal hypobromites, which may be easily prepared by the action of bromine upon aqueous solutions of alkali metal hydroxides, are frequently applied as oxidants in quantitative analysis. During these oxidationreduction reactions hypobromites change into bromides according to Eq. (1) [1-51:At first individual papers were published referring to the application of hypobromites in titrimetric determinations [6][7][8][9]. Later, Jellinek and Kresteff [10] suggested hypochlorites as a general agent for oxidimetric titrations. However, great problems arose when solutions of hypochlorites and hypobromites were used for titrations, because of their instability. Another problem in these titrations was the selection of a suitable method for the indication of the equivalence point. Many authors studied the application of hypochlorites and hypobromites for titrimetric analyses. Kolthoff and Stenger [I 1] suggested application of a more stable solution of calcium hypochlorite instead of unstable alkali metal hypochlorites, and addition of potassium bromide to the titrated solution so that hypobromite formed during the titration exhibited oxidative action. In most titrations it is recommended to add excessive amount of titrant (= reagent) to the titrate (= analyzed substance) and to re-estimate the excess of titrant by means of direct or indirect titration. Many authors studied various methods of application of hypochlorites and hypobromites in titrimetric analysis and developed various methods of assays with these reagents (see surveys of literature dealing with oxidation-reduction titrations [2,3]).

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La Détermination des Thiosulfates par L'Hypobromite de Soude en Milieu Alcalin

Claeys

Sion

1961

Bulletin des Soc Chimique

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Nous avons etudie le dosage des thiosulfates pal l'hypobromite en exces en milieu alcalin. Les solutions d'hypobromite de soude, preparees a partir d'une solution bromate-bromure sont caracterisees par une parfaite stabilite. La standardisation de I'hypobiomite est effectuee par voje iodometrique et donne des rksultats fort satisfaisants. Enfin, la determination des solutions de thiosulfate par addition de l'hypobromite en excbs et titration de cet exces par iodonietrie d o m e de bons rksultats, qui deviennent excellents pour des solutions decinormales en milieu alcalin. Comme ceux-ci sont de l'ordre de 0,Ol M, la methode proposee est surtout interessante pour la determination de faibles concentrations de thiosulfate.

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On the use of hypohalogenites in volumetric analysis. I. The hypobromite

Cited by 12 publications

References 0 publications

Stability of Hypobromite and Hypoiodite Reagents.

Stability of Hypobromite and Hypoiodite Reagents.

Enthalpimetric determinations with sodium hypobromit

La Détermination des Thiosulfates par L'Hypobromite de Soude en Milieu Alcalin

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