BARIUM DIPHENYLAMINE

Potassium dichromate exhibits much greater stability in aqueous solution in comparison to potassium permanganate. Potassium dichromate possesses an inherent oranage colour that is not intense enough to serve its own end-point signal, specifically in the presence of the green Cr3+ ion, which is supposed to be present at the end-point. Hence, redox indicators are usually employed to locate the exact end-point e.g., barium diphenylamine sulphonate. 

Examples Barium diphenylamine sulphonate 2,7-dichlorofluorescein Fluorescein (0.2% w/v in Ethanol) Morin (0.1% w/v in Ethanol) Sodium fluorescinate (0.4% w/v in water) Rhodamine B Zinc Silicate Calcium silicate Methylumbelliferone (or 7-hydroxy-4-methyl coumarin). 

Barium Diphenylamine Sulfonate TS Dissolve 300 mg of p-diphenylamine sulfonic acid barium salt in 100 mLof water. 

Bacterial Alpha-Amylase Activity, 789 Bacterial (PC) Proteolytic Activity, 811 Baking Soda, 355 Balances and Weights, 729 Balsam Fir Oil, 156 Balsam Peru Oil, 38, 574 Barium Chloride TS, 850 Barium Diphenylamine Sulfonate TS, 850 Barium Hydroxide TS, (S 1)114 Barium Hydroxide, 0.2 N, 856 Barium Standard Solution, 849 Basil Oil, Comoros Type, 39, 574 Basil Oil, European Type, 39, 579 Basil Oil, Italian Type, 39 Basil Oil, Reunion Type, 39 Basil Oil Exotic, 39 Basil Oleoresin, 391, 392 Bay Leaf Oil, 217 Bay Oil, 40, 575 BCD, (S 1)15 Beeswax, White, 40 Beeswax, Yellow, 41 Beet Fiber, (S1 )45 Beet Sugar, 400, (S2)35 Benedict s Qualitative Reagent, 850, 851 Bentonite, 41 Benzaldehyde, 456, 607 Benzaldehyde Glyceryl Acetal, 456, 607, (S1)60... 

Dissolve a quantity of sample to contain about 0 2 g of ferrous iron in 25 ml of water and dilute with about 60 ml of dilute sulphuric acid. Add 5 ml of syrupy phosphoric acid, 6 drops of a 0 2 per cent aqueous solution of barium diphenylamine sulphonate and titrate with 0 1 N potassium dichromate. 1 ml 0 1 N = 0 005585 gFe 0 01699 gC4H204pe. 

Bulk powders are made in considerable variety, but they consist always of nitrocellulose fibers which are stuck together but are not completely colloided. Some contain little else but nitrocellulose others contain, in addition to potassium and barium nitrates, camphor, vaseline, paraffin, lampblack, starch, dextrine, potassium dichromate or other oxidizing or deterrent salts, and diphenylamine for stabilization, and are colored in a variety of brilliant hues by means of coal-tar dyes. In the United States bulk powders are manufactured by one or the other of two processes, either one of which, however, may be modified considerably the materials are incorporated under wooden wheels, grained, and partially gelatinized, or the grains arc formed in a still where a water suspension of ptdped nitrocellulose is stirred and heated with a second liquid, a solvent for nitrocellulose which is volatile and immiscible with water. 

Composition A smokeless powder not completely col-Ioided and mixed with inorganic nitrates for the purpose of granulation. A nitrocellulose of approximately 13.15 per cent nitrogen is mixed with about 16 per cent of a mixture of equal parts of potassium nitrate and barium nitrate and a small amount of diphenylamine as stabilizer. 

Dissolve 0.32 g of the barium salt of diphenylamine sulfonic acid in 100 mL of water, add 0.5 g of sodium sulfate and filter off the precipitate of BaSO. ... 

Gunpowder (nitrocellulose + nitroglycerine) with stabilizers such as diphenylamine and diethyldiphenylurea, burning rate modifiers and coolants such as potassium nitrate, potassium sulfate, barium nitrate, or dinitrotoluene. 

Aluminum acetate Aluminum caprylate Aluminum distearate Aluminum myristates/palmitates Aluminum stearate Aluminum tristearate N-2-Aminoethyl-3-aminopropyl trimethoxysilane Aminoethylethanolamine Aminomethyl propanol Aminopropyltriethoxysilane Aminopropyltrimethoxysilane Ammonium benzoate Ammonium borate Ammonium citrate dibasic Ammonium laureth sulfate Ammonium laureth-5 sulfate Ammonium laureth-7 sulfate Ammonium laureth-12 sulfate Ammonium laureth-30 sulfate Ammonium lauryl sulfate Ammonium maleic anhydride/diisobutylene copolymer Ammonium oleate Ammonium persulfate Ammonium polyacrylate Ammonium potassium hydrogen phosphate Ammonium stearate Ammonium sulfamate Ammonium thiocyanate Ammonium thiosulfate Amyl acetate Antimony trioxide Asbestos Asphalt Azelaic acid 2,2 -Azobisisobutyronitrile Barium acetate Barium peroxide Barium sulfatej Bentonite Benzalkonium chloride Benzene Benzethonium chloride Benzothiazyl disulfide Benzoyl peroxide Benzyl alcohol Benzyl benzoate 1,3-Bis (2-benzothiazolylmercaptomethyl) urea 1,2-Bis (3,5-di-t-butyl-4-hydroxyhydrocinnamoyl) hydrazine 4,4 -Bis (a,a-dimethylbenzyl) diphenylamine Bisphenol A Bis (trichloromethyl) sulfone Boric acid 2-Bromo-2-nitropropane-1,3-diol 1,4-Butanediol Butoxydiglycol Butoxyethanol Butoxyethanol acetate n-Butyl acetate Butyl acetyl ricinoleate Butyl alcohol Butyl benzoate Butyl benzyl phthalate Butyidecyl phthalate Butylene glycol t-Butyl hydroperoxide... 

Acetone Barium Carbazole Cyanuric chloride 2,2-Dimethylpropanol 2,6-Dinitrotoluene Diphenylamine Guanidine nitrate Nitrogen Potassium alum anhydrous Resorcinol Sodium alum explosive mfg., safety Ammonium oxalate explosive primers Zirconium explosive, high... 

Of the derivatives of p-phenylenediamine, the most effective are the N, N -di-alkyl derivatives, in which the alltyl possesses a branched hydrocarbon chain on the carbon closest to the nitrogen atom [235]. They are usually produced by reductive allq lation of p-nitroaniline, p-phenyl-enediamine, p-nitrodiphenylamine, p-nitrosodiphenylamine, or p-amino-diphenylamine with aldehydes and ketones [236-252] with hydrogen at a temperature of 100-250°C and a pressure from 5 to 200 atm in the presence of catalysts. Copper-chromium catalysts (mixtures of oxides of the metals chromium, copper, barium, etc.) [241, 242, 245-247, 249, 250], iodine in the presence of HCl, HBr, or HI [253, 254], Pt/C [245, 252], and Raney nickel [244] are most often used as the catalysts. 

Finally, the formed diquinonediimine can be oxidized once more, but this time irreversibly (from a chemical standpoint—see the concept of reversibility in electrochemistry) when it stays too long in the presence of the oxidizing solution. Diphenylamine can be used in the case of the titration of ferrous ions by potassium dichromate. It is poorly soluble in water. This is the reason why the barium and sodium salts of diphenylaminesulfonic acid are used. Another interesting indicator deriving from diphenylamine is variamine blue. The structures of its reduced (colorless) and oxidized (blue-violet) forms are... 

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