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IUPAC name. iron(III) chromate ... chromate is the iron(III) salt of chromic acid with the chemical formula Fe 2 (CrO 4) 3. Discovery ... 4 Fe 2 O 3 + 6 Cr 2 O 3 + 9 ...
Further condensation reactions can occur in strongly acidic solution with the formation of trichromates, Cr 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−
Chromium oxide may refer to: Chromium(II) oxide, CrO; Chromium(III) oxide, Cr 2 O 3; Chromium dioxide (chromium(IV) oxide), CrO 2, which includes the hypothetical compound chromium(II) chromate; Chromium trioxide (chromium(VI) oxide), CrO 3; Chromium(VI) oxide peroxide, CrO 5; Mixed valence species, such as Cr 8 O 21
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.
[3] Aqueous chromium(VI) oxide peroxide decomposes in a few seconds, turning green as chromium(III) compounds are formed. [4] 2 CrO(O 2) 2 + 7 H 2 O 2 + 6 H + → 2 Cr 3+ + 10 H 2 O + 7 O 2. Stable adducts of the type CrO(O 2) 2 L include those with L = diethyl ether, 1-butanol, ethyl acetate, or amyl acetate. They form by adding a layer of the ...
Calcium chromate is an inorganic compound with the formula CaCrO 4, i.e. the chromate salt of calcium. It is a bright yellow solid which is normally found in the dihydrate form CaCrO 4 ·2H 2 O. A very rare anhydrous mineral form exists in nature, which is known as chromatite .
Other compounds with the general formula Cr(ClO 4) 3 (NH 3) x are also known. When x = 3, this compound is red, when x = 4 or 5, it is orange. [5] The hexammine complex will explode. [5] Cr(ClO 4) 3 can also form complexes with N 2 H 4, such as purple Cr(ClO 4) 3 ·2N 2 H 4. [6]
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 ...