Barium acetate chromate

In metallic form, barium is very reactive, reacting readily with water to release hydrogen. In aqueous solution it is present as an ion with a +2 charge. Barium acetate, chloride, hydroxide, and nitrate are water-soluble, whereas barium arsenate, chromate, duoride, oxalate, and sulfate are not. Most water-insoluble barium salts dissolve in dilute acids barium sulfate, however, requkes strong sulfuric acid. 

If the chromium is in solution as a chromate or dichromate, as is the case after fusion as described above, it may either be reduced to the trivalent condition and precipitated as hydroxide, or directly precipitated as an insoluble chromate. In the absence of sulphates, barium chromate is precipitated by the addition of barium acetate at the boiling-point to a solution made faintly acid -with acetic acid and containing a little alcohol. After ignition the precipitate is w eighed as barium chromate. If chlorides and sulphates are present only in small amount, the chromate may be thrown down by mercurous nitrate, the mercurous chromate then being converted by ignition to the sesqui-... 

Copper chromite (Lazier catalyst). Supplier Harshaw (CU-0202P 556-002). For preparation of the catalysC an aqueous solution of barium nitrate and cupric nitrate trihydrate is stirred during addition of a solution of ammonium chromate, prepared from ammonium dichromate and aqueous ammonia. The reddish brown precipitate of copper barium ammonium chromate is washed and dried and decomposed by heating in a muffle furnace at 350-450 . The ignition residue is pulverized, washed with 10% acetic acid, dried, and ground to a fine black powder. 

Note Both above specifications give 370.2 as the factor, which seems to be an error e) Acetate Resin. Subtract from 100% the sum of percentages of diatomaceous earth, ferric oxide and zirconium Method No 214. Ig niter Composition Type II of Delay Charge Compositions Z-2A or Z-2B. Its composition Barium Chromate, Zirconium Acetate Resin and procedures... 

Refs 1) Beil, not found 2)B.Werbel L. Key, The Use of Vinyl Alcohol Acetate Resin in Barium Chromate/Boron Compositions , PATR 3250 (1965) 3) J.A. Carrazza, Jr ... 

The part insoluble in ammonium acetate, containing the lead chromate, barium sulphate and clay, is suspended in 50 c.c. of water, treated with 25 c.c. of caustic potash solution (112 grams per litre) and heated to boiling for 10 minutes the lead chromate dissolves, whilst the barium sulphate and clay or kaolin remain undissolved and are collected, calcined and weighed. 

Chemical kinetics deductions are, in some circumstances, possible from a reaction system using a dispersed solid. If the solid is entirely insoluble, for example a supported catalyst, true surface kinetics can be obtained provided (i) it can be shown that the chemical reaction on the surface is much slower than the associated mass transfer, and (ii) the surface area of the solid can be obtained. These conditions applied in the case of the oxidation of an aqueous solution of hydrazine using a dispersion of insoluble barium chromate [16]. Another case is where it can be shown that an increase in the amount of the solid component does not increase the reaction rate. In this case, exemplified by the formation of benzyl acetate from benzyl bromide and solid sodium acetate in toluene solvent, it is likely that the reaction occurs in the solution phase and that the reaction is proceeding at the saturation concentration of the solid reactant in the liquid phase [17]. 

Barium chloride Pale yellow precipitate of barium chromate soluble in dilute mineral acids insoluble in water and in acetic acid... 

For analytical purposes the solubility has also been determined in dilute acetic acid and in solutions of ammonium salts, and Waddell has shown that for washing barium chromate, pure water is preferable to a one per cent, ammonium acetate solution, which latter dissolves about four times as much of the salt as an equal quantity of water. 

AMMONIUM NITRATE (6484-52-2) A strong oxidizer. An ingredient in dynamite. Violent reaction and/or the formation of explosive mixtures with hot water, reducing agents, combustible materials, organic materials, ammonium dichromate, barium chloride, barium nitrate, charcoal, cyanoguanidine, phosphorus, potassium chromate, potassium dichromate, potassium nitrate, potassium permanganate, sodium chloride, finely divided metals. Forms explosive or heat- and shock-sensitive compounds with acetic acid, alkali metals (potassium, sodium, etc.), ammonia, nitric acid, sodium hypochlorite, sulfur, urea. At elevated temperatures, contained or confined material may explode violently. 

Materials Solutions of calcium, strontium, and barium chlorides, ammonium carbonate, ammonium oxalate, acetic acid, and sodium chromate, calcium sulphate, strontium sulphate. 

Make equilibria diagrams for the cases of calcium chromate and acetic acid and of barium chromate and acetic acid. (3) Why does acetic acid act differently with these two chromates ... 

Chromates.—(1.) HaS in acid solution, brownish color, changing to green. (3.) Ammonium sulfhydrate, greenish ppt. (3.> Barium chlorid, yellowish ppt. (4.) Silver nitrate, brownish-red ppt., soluble in HNOsOr KHtHO. (5.) Lead acetate, yellow ppt.> soluble in potash, insoluble in acetic acid. 

When an aq. soln. of a barium salt, or baryta-water is treated with alkah mono- or di-chromate, a pale yellow precipitate of barium Chromate, BaCr04, is deposited. J. D. Smith said that the precipitation with a barium salt is as delicate a test for chromate as it is for sulphates. F. T. Frerichs, and H. Kammerer obtained a complete precipitation in the presence of acetic acid or sodium acetate. 

B. Guerini observed that 0-22 X10 gram-equivalent of barium chromate are dissolved by a litre of 45 per cent, alcohol, and A. Naumann observed that it is insoluble in acetone, and in methyl acetate. I. Meschtschersky, and H. Baubigny said that the chromate is soluble in acetic acid while H. Caron and D. A. Raquet said that barium chromate is insoluble in acetic acid and soln. of alkali chromate, but partially soluble in a mixture of dichromate and acetic acid. According to... 

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