Sodium ammonium chromate

Ammonium Sodium Chromate, (NH4)NaCrO,j.2H20, crystallises in prisms of density 1-842 at 15° C. ... 

Manufacture The primary iadustrial compounds of chromium made directly from chromite ore are sodium chromate, sodium dichromate, and chromic acid. Secondary chromium compounds produced ia quantity include potassium dichromate, potassium chromate, and ammonium dichromate. 

Ammonium chromate Potassium chromate Chromium potassium sulphate Lithium chromate (yitomium trinitrate Sodium chromate Clsomium fV )oxide Lead chromate Strontium chromate 2nc ctvomate... 

Sulfoalkylated naphthol compounds are effective as dispersants in aqueous cement slurries. The compounds can also be applied in an admixture with water-soluble inorganic compounds of chromium to provide additives of increased overall effectiveness. Particularly suitable are sodium chromate or ammonium dichromate. a-Naphthol is reacted in an alkaline aqueous medium with formaldehyde to create condensation products. The aldehyde can be reacted with bisulfite to produce sulfoalkylated products [1404,1410]. 

Sodium chromate is produced as part of the process for obtaining Cr203, and it is probably the most important chromium compound. Although there are other oxides of chromium, Cr203 is very important because of its catalytic properties. One way to obtain this oxide is by the decomposition of ammonium dichromate,... 

A technique of developing Aniline Black directly on the fiber was found by Lightfoot in the period between 1860 and 1863. In accordance with this process, the fiber is soaked with aniline, aniline hydrochloride, and sodium chlorate in the presence of an oxidation catalyst (e.g., ammonium vanadate, potassium hexa-cyanoferrate(II)). The compound is developed at 60 to 100°C and then oxidized further with sodium chromate. It should be noted, however, that Perkin had already synthesized a black compound which he called Aniline Black as early as 1856. He oxidized aniline (containing toluidine) with potassium dichromate and separated Aniline Violet from the resulting black mixture (Aniline Black). 

Synonym Neatsfoot Oil Necatorina Nechexane Neutral Ahhonium Pluoride Neutral Anhydrous Calcium Hypochlorite Neutral Lead Acetate Neutral Nicotine Sulfate Neutral Potassium Chromate Neutral Sodium Chromatetanhydrous Neutral Verdigris Nickel Acetate Nickel Acetate Tetrahyorate Nickel Ammonium Sulfate Nickel Ammonium Sulfate Hexahydrate Nickel Bromide Nickel Bromide Trihydrate Nickel Carbonyl Nickel Chloride Nickel Chloride Nickel Cyanide Nickel Iiu Fluoborate Nickel Fluoroborate Solution Nickel Fluoroborate Nickel Formate Nickel Formate Dihyorate Nickel Nitrate Nickel Nitrate Hexahydrate Nickel Sulfate Nickel Tetracarbokyl Nickelous Acetate Nickelous Sulfate Nicotine Nicotine Sulfate Nifos Nitralin Nitram O-Nitraniline P-Nitraniline Nitric Acid Nitric Acid, Aluminum Salt Nitric Acid, Iron (111) Salt Compound Name Oil Neatsfoot Carbon Tetrachloride Neohexane Ammonium Fluoride Calcium Hypochlorite Lead Acetate Nicotine Sulfate Potassium Chromate Sodium Chromate Copper Acetate Nickel Acetate Nickel Acetate Nickel Ammonium Sulfate Nickel Ammonium Sulfate Nickel Bromide Nickel Bromide Nickel Carbonyl Nickel Chloride Nickel Chloride Nickel Cyanide Nickel Fluoroborate Nickel Fluoroborate Nickel Fluoroborate Nickel Formate Nickel Formate Nickel Nitrate Nickel Nitrate Nickel Sulfate Nickel Carbonyl Nickel Acetate Nickel Sulfate Nicotine Nicotine Sulfate Tetraethyl Pyrophosphate Nitralin Ammonium Nitrate 2-Nitroaniline 4-Nitroaniline Nitric Acid Aluminum Nitrate Ferric Nitrate... 

M. Couleru recommends the use of a cone. soln. of sodium chromate for the successful production of perchlorates. The action is similar to that which is obtained by a little chromate in the electrolyte during the production of chlorates. The sodium perchlorate so produced is very soluble and deliquescent, and it is not usually worked up, but rather converted into the ammonium or potassium salt by the addition of ammonium or potassium chloride. It is advisable to ensure that all the chlorate has been converted into perchlorate before precipitating the perchlorate, otherwise the perchlorate will be contaminated by the chlorate in solid soln. which cannot be removed by washing. A. Angeli recommends electrolyzing... 

In the one-bath chroming method (metachrome process), complex formation must be preceded by dye diffusion. For this reason, the release of CrVI must be delayed. The dye liquor is prepared with metachrome mordant (a mixture of sodium chromate and ammonium sulfate) and sodium sulfate. After a prerun at 40-50 °C, the system is heated slowly and dyed at boiling temperature for 45-90 min. Shortly before dyeing is completed, the bath is exhausted by the addition of acetic acid. 

Molybdenum salts used as catalysts include cobalt molybdate for hydrogen treatment of petroleum stocks for desulfurization, and phospho-molybdates to promote oxidation. Compounds used for dyes are sodium, potassium, and ammonium molybdates. With basic dyes, phosphomolyb-dic acid is employed. The pigment known as molybdenum orange is a mixed crystal of lead chromate and lead molybdate. Sodium molybdate, or molybdic oxide, is added to fertilizers as a beneficial trace element. Zinc and calcium molybdate serve as inhibitory pigments in protective coatings arid paint for metals subjected to a corrosive atmosphere. Compounds used to produce better adherence of enamels are molybdenum trioxide and ammonium, sodium, calcium, barium, and lead molybdates. 

Acute inhalation LC50 values in rats for several chromium(VI) compounds (sodium chromate, sodium dichromate, potassium dichromate, and ammonium dichromate) ranged from 29 to 45 mg chromium(VI)/m3 for females and from 33 to 82 mg chromium(VI)/m3 for males (Gad et al. 1986). 

Single-dose dermal LD50 values in New Zealand rabbits exposed to chromium(VI) as sodium chromate, sodium dichromate, potassium dichromate, and ammonium dichromate were determined by Gad et al. (1986). LD50 values ranged from 361 to 553 mg chromium(VI)/kg for females and from 336 to 763 mg chromium(VI)/kg for males. Signs of toxicity included dermal necrosis, eschar formation, dermal edema and erythema, and diarrhea and hypoactivity. The dermal LD50 value for chromium trioxide was 30 mg chromium(VI)/kg for combined sexes (American Chrome and Chemical 1989). The LD50 values are recorded in Table 2-3. 

Bleaching powder Sodium chlorite Sodium chlorate Potassium chlorate Barium chlorate Silver chlorate Ignition Ignition Ignition Ignition Ignition Ignition Sodium chromate Potassium chromate Ammonium dichromate Sodium dichromate Potassium dichromate Barium peroxide Smoke Smoke Smoke Smoke Smoke Smoke to... 

Basic salts are produced wdien cobalt salts are precipitated with sodium chromate, or when the alkali-containing double salts first produced by precipitation with ammonium or potassium chromates are subjected to continued treatment with hot water. The following double salts have been described ... 

Na2Cr04 sodium chromate 7775-11-3 25.00 2.7200 1 3153 NiH20N2O14S2 nickel ammonium sulfate hexahydrate 7785-20-8 25.00 1.9230 1... 

The influence of the concentration of sodium hydroxide used as regenerant on the concentration of sodium chromate recovered from a weak base resin has been investigated on the laboratory scale [32, 33]. Also, the influence of the concentration of nitric or sulfuric acid on the concentration of ammonium nitrate or sulfate recovered from a strong acid resin has been investigated on the pilot-plant scale [ 1, Sl. These studies have confirmed the above observation... 

Crown ether 18-crown-6, ethanol, trichloromethane, potassium permanganate, manganate and dichromate, sodium chromate and ammonium dichromate. 

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

Less than 15% of the ore is transformed into chromium compounds, principally chromates, dichromates, chromium(VI) oxide, chromium(III) oxide, and so on. Alkaline oxidative roasting of chromite in rotary kilns yields sodium chromate (see equation 1), which is leached out with water and typically converted into sodium dichromate with sulfuric acid (equation 2) or carbon dioxide (equations). Further treatment of sodium dichromate with sulfuric acid yields chromium(VI) oxide ( chromic acid ), while its reduction (with carbon, sulfur, or ammonium salts) produces chromium(III) oxide. Finally, basic chromium(Ill) salts, for example Cr(OH)S04, which are used as tanning agents for animal hides, also result from reduction of sodium dichromate. Heterogeneous chromium catalysts are used for the polymerization of ethylene. 

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