Results 131 to 140 of about 7,121 (176)

The basic properties of orthophosphoric acid

Recueil des Travaux Chimiques des Pays-Bas, 1937
AbstractOn adding together H3PO4 and HClO4 a substance of the composition H3PO4. HClO4 is formed with a melting point of 46°‐47°. It is shown by the electrolysis of its solution in CH3NO2 that the H3PO4 forms a positive ion, from which follows that H3PO4 has basic properties towards the strong acid HClO4.
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Controlled decrease of acid strength by orthophosphoric acid on ZSM5

Applied Catalysis, 1986
Abstract H3PO4 was used to decrease the acid strength of ZSM5. The effects of increasing amounts of phosphorus were studied by SEM, i.r. spectroscopy and t.p.d.. Phosphorous converts strong Bronsted acid sites into weak Bronsted acid sites without changing the overall acid-base properties. The degree of conversion was monitored by the t.p.d.
J.A. Lercher, G. Rumplmayr
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Corrosion of a Borosilicate Glass by Orthophosphoric Acid

Journal of the American Ceramic Society, 1983
A borosilicate glass was resistant to orthophosphoric acid at 95°C, whereas considerable corrosion occurred at higher temperatures. Tenacious crystal formation provided a barrier against further attack, but also produced stress resulting in spontaneous glass breakage.
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Reaction of Cellulose with Aqueous Solutions of Orthophosphoric Acid

Fibre Chemistry, 2002
Experimental data were obtained that suggest that total amorphization of hydrated cellulose is attained in 79-80% aqueous solutions of H3PO4. The reaction of cellulose with aqueous solutions of H3PO4 is accompanied by selective sorption of molecules of the acid. Aqueous, especially concentrated, solutions of H3PO4 are characterized by low wetting power
V. V. Vinogradov, L. N. Mizerovskii, O. P. Akaev   +2 more
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Welding corundum parts with orthophosphoric acid paste

Refractories, 1968
We studied the effect of adding orthophosphoric acid to pastes of alumina for welding corundum ceramic, and clarified the optimal technological process parameters. The use of aluminophosphate bond enables us to weld corundum ceramics at 900°C under pressure.
I. S. Kainarskii, I. L. Boyarina, �. V. Degtyareva   +2 more
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The chemistry of orthophosphoric acid and its sodium salts

Journal of Chemical Education, 1968
The purpose of this article is to suggest a number of possible laboratory investigations of the chemistry of phosphoric acid and its sodium salts involving potentiometric titration studies and thermochemical studies.
H. A. Neidig, T. G. Teates, R. T. Yingling   +2 more
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Cytological Fixation with Salicylic and Orthophosphoric Acids

Stain Technology, 1934
The effect of fixation with salicylic and phosphoric acids upon the chromosome structure in the root tip of Narcissus poeticus was investigated. Salicylic acid and 3 1/3% phosphoric acid were tried in twenty different combinations with 4% formaldehyde, 2.5% chromic acid, and copper hydroxide.
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[Determination of orthophosphoric and orthophosphorous acids in the workplace air using ion chromatography].

Meditsina truda i promyshlennaia ekologiia, 1997
The authors elaborated a method measuring air level of orthophosphorous and orthophosphoric acids by means of ion chromatography within the range of 0.1-25 mg/cu m. The samples are extracted through concentration on a filter. The analysis regime includes depression of the background levels.
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Dehydration of Orthophosphoric Acid

Analytical Chemistry, 1955
C. E. Higgins, W. H. Baldwin
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Stability of enamels to orthophosphoric acid

Glass and Ceramics, 1974
Yu. M. Petrenko, L. A. Savina, V. L. Sukhotinskii   +2 more
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