WHAT IS Ammonium Dichromate

Ammoniumdichromate is the asleep admixture with the blueprint (NH4)2Cr2O7. In this compound, as in all chromates and dichromates, chromium is in a +6 blaze state, frequently accepted as hexavalent chromium. It is a alkali consisting of ammonium ions and dichromate ions.

Ammoniumdichromate is sometimes accepted as Vesuvian Fire, because of its use in demonstrations of tabletop "volcanoes". It has been acclimated in pyrotechnics and in the aboriginal canicule of photography.

It has been acclimated in pyrotechnics and in the aboriginal canicule of photography as able-bodied as in lithography, as a antecedent of authentic nitrogen in the laboratory, and as a catalyst. It is aswell acclimated as a acerbic for dyeing pigments, in the accomplishment of alizarin, chrome alum, covering tanning and oil purification.

Photosensitive films absolute PVA, ammonium dichromate, and a phosphor are spin-coated as aqueous slurries in the assembly of the phosphor raster of television screens and added devices. The ammonium dichromate acts as the photoactive site.


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FROM: chromium-chromium

what is Chromium

Chromium  is a actinic aspect which has the attribute Cr and diminutive amount 24. It is the aboriginal aspect in Group 6. It is a steely-gray, lustrous, harder metal that takes a top brightness and has a top melting point. It is aswell odorless, tasteless, and malleable. The name of the aspect is acquired from the Greek chat "chrōma" (χρώμα), acceptation colour, because abounding of its compounds are acutely coloured. Chromium oxide was acclimated by the Chinese in the Qin absolutism over 2,000 years ago to covering weapons such as brownish crossbow bolts and animate swords begin at the Terracotta Army. It afterwards came to the absorption of the West if it was apparent by Louis Nicolas Vauquelin in the mineral crocoite (lead(II) chromate) in 1797. Crocoite was acclimated as a pigment, and afterwards the analysis that the mineral chromite aswell contains chromium, this mineral was acclimated to aftermath pigments as well.

Chromium was admired with abundant absorption because of its top bane attrition and hardness. A above development was the analysis that animate could be fabricated awful aggressive to bane and birthmark by abacus chromium to anatomy stainless steel. This application, forth with chrome plating (electroplating with chromium) are currently the highest-volume uses of the metal. Chromium and ferrochromium are produced from the individual commercially applicable ore, chromite, by silicothermic or aluminothermic acknowledgment or by baking and leaching processes.

Although trivalent chromium (Cr(III)) is appropriate in trace amounts for amoroso and lipid metabolism, few cases accept been appear area its complete abatement from the diet has acquired chromium deficiency. In beyond amounts and in altered forms, chromium can be baneful and carcinogenic. The a lot of arresting archetype of baneful chromium is hexavalent chromium(Cr(VI)). Abandoned chromium assembly sites generally crave ecology cleanup.

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the properties of Chromic Hydroxide

CAS Registry Number: 1308-14-1

CAS Name: Chromium hydroxide

Additional Names: chromic oxide gel; chromic oxide, hydrous

Molecular Formula: CrH3O3

Molecular Weight: 103.02

Percent Composition: Cr 50.47%, H 2.94%, O 46.59%

Line Formula: Cr(OH)3

Literature References: Occurs alone as hydrates. Prepn: Ruthroff, Inorg. Synth. 2, 190 (1946); Hein, Herzog in Handbook of Preparative Inorganic Chemistry vol. 2, G. Brauer, Ed. (Academic Press, New York, 2nd ed., 1965) pp 1345-1346.

Derivative Type: Trihydrate

Molecular Formula: Cr(OH)3.3H2O

Molecular Weight: 157.06

Percent Composition: Cr 33.11%, O 61.12%, H 5.78%

Chromic Hydroxide Properties: Or Cr2O3.9H2O, blue-green powder. Practically insol in water. Sol in dil mineral acids if afresh prepd, giving dejected or blooming soln; becomes insol in acids on aging. Cr(OH)3.nH2O, shining, vitrous, jet-black particles. Useful as agitator in dehydrogenation of alcohols and paraffins, hydrogenation of olefins.

Chromic Hydroxide is used as pigment; in tanning industry; as mordant; as agitator for amoebic reactions.


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the information of Chrome-green

Offering Chrome Green.

Product name:Chrome green

Cas No.: 1308-38-9

Molecular Formula: Cr2O3

Molecular Weight: No

Package: 25KG/BAG

Purity: 99%

Description: blooming apparent powder

Hexagonal clear or baggy olive-green crumb with brownish luster. Specific gravity: 5.21, Melting point: 226625 Boiling point: 4000 baffling in baptize or acid. Chrome-green is Soluble in hot brownish acrid bromate solution. Extremely abiding adjoin light, air, top temperature,corrosive gases (SO2, H2S). Top accoutrement power, alluring properties.

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from: chromate dichromate