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Barium selenates

The solubility of BaSe04(cr) in water in the temperature interval 288 to 368 K was determined by Selivanova and Shneider [58SEL/SHN3], see Appendix A. The solubility is [Pg.407]

The standard Gibbs energy of formation of barium selenate is calculated from the Gibbs energy of Reaction (V.183) and the selected values of AfG° for the ions to be  [Pg.408]

The value in [82WAG/EVA] is - 1044.7 kJ-moP. It has apparently been calculated from the data in [58SEL/SHN3]. The difference from the result of the review is caused by the new ionic Gibbs energies introduced. [Pg.408]

Pure selenic acid may be prepared from the solutions obtained in the foregoing processes by first neutralising with ammonia, precipitating barium selenate by the addition of barium chloride, and heating the separated precipitate with a solution containing the correct quantity of sulphuric acid. After removing the barium sulphate, a solution of pure selenic acid remains, and if this is concentrated as far as possible (see... [Pg.332]

With the exception of the calcium, strontium, barium and mercurous salts, the normal selenates are readily soluble in water. Barium chloride and mercurous nitrate are therefore convenient precipitation agents.6 Barium selenate is, however, more soluble than barium sulphate, and also differs from the latter salt in being slowly reduced to selenite by hydrochloric acid 7 for these reasons precipitation with barium chloride is not applicable to the quantitative determination of selenie acid. A concentrated solution of selenie acid which has been saturated with barium selenate deposits crystals of barium selenie acid, H2[Ba(Se04)2].8... [Pg.336]

Barium chloride solution white precipitate of barium selenate, BaSe04, insoluble in dilute mineral acids. The precipitate dissolves when boiled with concentrated hydrochloric acid, and chlorine is evolved (distinction and separation from sulphate). [Pg.521]

Ba04Se barium selenate 7787-41-9 25.00 4.7500 1 692 CaC2H205 calcium oxalate monohydrate 5794-28-5 25.00 2.2000 1... [Pg.298]

Table A-9 Solubility of barium selenate in water, results from two parallel experiments. Table A-9 Solubility of barium selenate in water, results from two parallel experiments.
SEL/SHN3] Selivanova, N. M., Shneider, V. A., On some physico-chemical properties of barium selenate, Nauchn. Dokl. Vyssh. Shk., Khim. Khim. Tekhnol, 2, (1958), 216-220, in Russian. Cited on pages 407, 408, 447. [Pg.667]

The selenates are formed by oxidation of the selcnites or by fusion of selenium or selenium dioxide with KNOa or Na202. They resemble the sulfates remarkably, in hydration, crystalline form, and solubility. Barium selenate, while highly insoluble in water, is reduced with boiling HC1 solu tion, yielding the soluble H2Se03. This treatment reduces all selenates, and consequently it is of value in the detection of selenium in the higher state of oxidation. [Pg.324]

Se02F2 has been prepared by warming a mixture of barium selenate and fluorosulfonic acid. It is a rather reactive gas, readily hydrolyzed by water. [Pg.455]

In the last step, the mixture is boiled. No colored precipitate is formed (distinctions of selenates and tungstates). Had the white precipitate been barium selenates or barium tungstates, they would have been reduced to elemental selenium and wolfram blue, respectively. ... [Pg.81]

Barium selenate BaSeO 3.40 10 Cobalt(II) hydroxide (blue) Co(OH)3 5.92 10- ... [Pg.1209]

See other pages where Barium selenates is mentioned: [Pg.89]    [Pg.331]    [Pg.201]    [Pg.1603]    [Pg.86]    [Pg.1649]    [Pg.331]    [Pg.89]    [Pg.49]    [Pg.160]    [Pg.35]    [Pg.407]    [Pg.700]    [Pg.1322]    [Pg.692]    [Pg.1278]    [Pg.744]    [Pg.1313]    [Pg.680]    [Pg.774]    [Pg.1079]    [Pg.1361]    [Pg.738]    [Pg.1023]    [Pg.772]    [Pg.1076]    [Pg.692]   


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