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2 Fe(NO 3) 3 + 3 K 2 CrO 4 → Fe 2 (CrO 4)3 + 6 KNO 3 It also can be formed by the oxidation by air of iron and chromium oxides in a basic environment: 4 Fe 2 O 3 + 6 Cr 2 O 3 + 9 O 2 → 4 Fe 2 (CrO 4 ) 3
3 O 2− 10, and tetrachromates, Cr 4 O 2− 13. [2] All polyoxyanions of chromium(VI) have structures made up of tetrahedral CrO 4 units sharing corners. [3] The hydrogen chromate ion, HCrO 4 −, is a weak acid: HCrO − 4 ⇌ CrO 2− 4 + H +; pK a ≈ 5.9. It is also in equilibrium with the dichromate ion: 2 HCrO − 4 ⇌ Cr 2 O 2− 7 + H 2 O
The main purpose of chemical nomenclature is to disambiguate the spoken or written names of chemical compounds: each name should refer to one compound. Secondarily, each compound should have only one name, although in some cases some alternative names are accepted. Preferably, the name should also represent the structure or chemistry of a compound.
[CoCl(NH 3) 5]Cl 2 pentaamminechloridocobalt(3+) chloride where ammine (NH 3)precedes chloride. The central atom name(s) come after the ligands. Where there is more than one central atom it is preceded by di- tri-, tetra- etc. Os 3 (CO) 12, dodecacarbonyltriosmium; Where there are different central atoms they are sequenced using the ...
Chromium compounds are compounds containing the element chromium (Cr). Chromium is a member of group 6 of the transition metals . The +3 and +6 states occur most commonly within chromium compounds, followed by +2; charges of +1, +4 and +5 for chromium are rare, but do nevertheless occasionally exist.
As with other Cr(VI) compounds, potassium chromate is carcinogenic. [3] The compound is also corrosive and exposure may produce severe eye damage or blindness. [ 4 ] Human exposure further encompasses impaired fertility, heritable genetic damage and harm to unborn children.
Caesium chromate is mainly obtained from the reaction of chromium(VI) oxide with caesium carbonate, wherein carbon dioxide gas is evolved: [3] CrO 3 (aq) + Cs 2 CO 3 (aq) → Cs 2 CrO 4 (aq) + CO 2 (g) Alternatively, salt metathesis between potassium chromate and caesium chloride can be performed: [4] K 2 CrO 4 (aq) + 2 CsCl(aq) → Cs 2 CrO 4 ...
Silver chromate is an inorganic compound with formula Ag 2 CrO 4 which appears as distinctively coloured brown-red crystals. The compound is insoluble and its precipitation is indicative of the reaction between soluble chromate and silver precursor salts (commonly potassium / sodium chromate with silver nitrate ).