Über Verbindungen von Alkaliphosphaten mit Wasserstoffperoxyd

Menzel, Heinrich; Gäbler, Curt

doi:10.1002/zaac.19291770118

Cited by 16 publications

(1 citation statement)

References 15 publications

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“…Two reports (3,15) give data for the Na2HP04-H202-I^0 system at 273 Κ but a com parison of the two reports cannot be made because the concentration range studied in one report (3) is too narrow. The other article (15) reports the presence of the two com pounds Na2HP04-1.5H202 [13769-82-9] and Na2HP04·2.5H202 [13769-83-0] at H202 concentra tions greater than 27 mass% for this system.…”

Section: Multicomponent Systemsmentioning

confidence: 94%

Disodium Hydrogenphosphate

Eysseltová

1988

Alkali Metal Orthophosphates

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Disodium Hydrogenphosphat e 9 7 COMPONENTS: (1) Sodium dihydrogenphosphate; NaH.PO,; [7558-80-7] 1 4 (2) Sodium perchlorate; NaClO^; [7601-89-0] (3) 2-Propanone (acetone); CoH.0; [67-64-1] J 0 (4) Water; H20; [7732-18-5] ORIGINAL MEASUREMENTS: Ferroni, G.; Galea, J.; Antonetti, G. BudW. Soc. Chim. Tl. 1974, 72, (Pt. 1), 273-81. VARIABLES: Concentration of NaClO. at 25°C. 4 PREPARED BY: J. Eysseltova EXPERIMENTAL VALUES: Composition of the saturated solutions at 25°C. Disodium Hydrogenphosphat e COMPONENTS: (1) Disodium hydrogenphosphate; Na2HP0,; [7558-79-4] (2) Water; H20; [7732-18-5] EVALUATOR: CRITICAL EVALUATION: THE BINARY SYSTEM Solubility data have been reported for the temperature interval 273-373 Κ (1), for the 272-313 Κ interval (2), and at 273, 291 and 298 Κ (3). Wendrow and Kobe (4) report their own extrapolated data as well as data obtained by others (5). Older data (7-13) are cited in the article by D'Ans and Schreiner (6). But these data appear to have a systematic error and were eliminated from consideration during the first graphical examination of the material. On the other hand, some data from studies of multicomponent systems (14-19) were consistent with those reported by others (1-3) and were included in the evaluation procedure.Several hydrates of disodium hydrogenphosphate have been reported. Wendrow and Kobe (4) stated that the transition temperatures of the dodecahydrate to the heptahydrate and of the heptahydrate to the dihydrate were 308.7 and 321.2 K, respectively. A more pre cise determination of these values (6) gives transition temperatures of 308.55 and 321.55 K, respectively. There is also a report of the existence of two forms of the dodeca hydrate with a transition temperature of 302.8 Κ (2), but this has not been confirmed by any other investigators. The transition temperature of the dihydrate to the anhydrous salt was said to be 368.2 Κ (4).All the experimental data that were not eliminated in the first graphical examina tion were evaluated by the method described in chapter 3. The data were fitted to equation [1], The precision of the published data was estimated to be about the same as Disodium Hydrogenphosphat e COMPONENTS: EVALUATOR:(1) Disodium hydrogenphosphate; Na2HP0,; [7558-79-4](2) Water; H20; [7732-18-5]

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Section: Multicomponent Systemsmentioning

confidence: 94%

Disodium Hydrogenphosphate

Eysseltová

1988

Alkali Metal Orthophosphates

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Das Verhalten von Wasserstoffperoxyd in wäßrigen Alkaliphosphatlösungen

Husain

1929

Z. Anorg. Allg. Chem.

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Die Befunde der Gefrierpunkts‐ und Verteilungsversuche sind nicht miteinander vergleichbar. Die letzteren lassen direkt freies und gebundenes Peroxyd in den Lösungen bestimmen, während die kryoskopischen Messungen eigentlich nur die Verringerung der osmotischen Konzentrationen in den Gemischen gegenüber den additiv aus Phosphat‐ und H2O2‐Gehalt erwarteten anzeigen. Wenn auch die Veränderungen der osmotischen Konzentrationen in erster Linie von der H2O2‐Bindung herrühren mag, so können nebenher auch noch andere Erscheinungen, etwa Beeinflussung der Hydrolyse der Phosphate durch H2O2 daran teilhaben. Weiterhin enthalten beide Verfahren methodische Mängel. Die ver Verteilungsversuche sind oben schon genannt. Bei den osmotischen Messungen seien die Ungenauigkeiten der rechnerischen Korrektur und der graphischen Darstellungsweise erwähnt.

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