Dichromate d’ammonium

DIBA = diisobutyladipate 163 dibutylphthalate 95 163 298 327 dibutylsebacate 163 dibutyltartrate 163 dichromate d ammonium 14 Dichte = density 77 dicyanodiamide 63 156 231 diethyldiphenylurea = Centralit I 56 ... 

SYNS AMMONIO piCROAIATO DI) (ITALIAN) AMMONIUMBICHROMAAT (DUTCH) AMMON-lUMDICHROMAAT (DUTCH) AMMONIUiM-DICHROMAT (GERMAN) AMMONIUM DICHROMATE AMMONIUM DICHROMATE(VI) BICHROMATE d AMMONIUM (FRENCH)... 

A copper-chromium oxide on pumice catalyst has particular value for the dehydrogenation of primary and secondary alcohols to the corresponding carbonyl compounds (see Section 5.6.1, p. 581). Dissolve 10.4g of barium nitrate (AnalaR) in 280 ml of water at about 80 °C and add to this hot solution 87 g of copper(n) nitrate trihydrate (AnalaR) stir the mixture and heat until a homogeneous solution results. Prepare a solution of 50.4 g of recrystallised ammonium dichromate in a mixture of 200 ml of water and 75 ml of concentrated ammonia solution (d 0.880). To the ammonium chromate solution at 25-30 °C add the hot (80 °C) nitrate solution in a thin stream with stirring. Allow the mixture to cool and filter off the yellowish-brown precipitate with suction press with a glass stopper and suck as dry as possbile. Transfer the... 

B)Propellants a)A variety of Fr sporting proplnt, Poudre (listed under Ammonium Dichromate) contd 3% of K dichromate(Ref 4,pp 86-7) b) Fr sporting proplnt Poudre Okell(Kei l,p 590) c)Older Amer proplnt patented in 1894 by the US Smokeless Powder Co Amm picrate 55, K or Na picrate 25 K dichromate 20%(Ref l,p 780) d)Some bulk powders listed in Ref 9,p 289 OPyrotechnic Composf/ions a)K dichromate 12, K chlorate 15, Zn dust 72, granulated charcoal 12 dextrin 2 parts(Ref 9,p 88) b)Italian illuminating mixt K dichromate 10,... 

If calcium chromate be treated with a soln. of potassium sulphate, the calcium chromate is converted into calcium sulphate, which is precipitated, and potassium chromate, which remains in soln. Instead of leaching the calcium chromate with a soln. of potassium sulphate, W. J. Chrystal showed that if ammonium sulphate is used, a soln. of ammonium chromate is produced, and J. J. Hood found that if the soln. of potassium salt be treated with sodium hydrosulphate, potassium sulphate crystallizes from the soln., while sodium dichromate remains in soln. According to F. M. and D. D. Spence and co-workers, if a mixtiu-e of ammonia and carbon dioxide be passed into the aq. extract of the calcium chromate. Calcium carbonate is precipitated while ammonium and alkali chromate remain in soln. If the liquid be boiled, ammonia is given off, and sodium dichromate remains in soln. S. Pontius used water and carbon dioxide under press, for the leaching ptocess. J. Brock and W. A. Rowell purified alkali chromite by treating the soln. with strontium hydroxide, and digesting the washed precipitate with a soln. of alkali sulphate or carbonate W. J. A. Donald used calcium hydroxide or barium chloride as precipitant. A mixture of chromite with calcium carbonate and potassium carbonate was formerly much employed. Modifications of the process were described by W. J. A. Donald, A. R. Lindblad, C. J. Head, 8. G. Thomas, W. Gow, J. Stevenson and T. Carlile, L. I. Popoff,G. Bessa, P.Weise, P. N. Lukianoff,... 

The absorption is slightly greater in the more dil. soln., and this points to slight dissociation with formation of some dichromate, which, however, is only produced in very minute quantity. H. Becquerel found that soln. of potassim chromate are transparent for the ultra-red rays and G. Massol and A. Faucon studied the transmission of ultra-violet rays. D. Brewster investigated the absorption spectrum of soln. of ammonium chromate and J. H. Gladstone, soln. of metal chromates. H. von Halban and H. Siedentopf found that a soln. of potassium chromate in 0-05A -KOH had the extinction coefE., e, for light of wave-length, A, when where C denotes the cone, in mols per litre. 

Transport experiments on potassinm chromate were made by J. F. Daniell and W. A. Miller, J. W. Hittorh R. Lenz, 0. Masson, B. D. Steele, R. B. Denison, and A. Charpentier F. Kohlrausch calcidated 72 for the transport number of CiO from the conductivity data of calcium chromate and M. S. Sherrill, 76-7 from the data of ammonium chromate and 40 for the HCrO/don. W. Hittorf, E. H. Riesenfeld, and A. Charpentier made observations with potassium dichromate and C. W. D. Whetham found the velocity of migration of the Cr207-ion to be 0-00047 cm. per sec. for a potential difference of one volt and the transport number to be 91. 

What is wrong with the chemical formula for each of the following compounds (a) (NH3)2C03 (ammonium carbonate), (b) CaOH (calcium hydroxide), (c) CdS03 (cadmium sulfide), and (d) ZnCr04 (zinc dichromate) ... 

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