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Chromium(III) hydroxide is a gelatinous green inorganic compound with the chemical formula Cr(OH) 3. It is a polymer with an undefined structure and low solubility. It is amphoteric , dissolving in both strong alkalis and strong acids .
Chromium(III) hydroxide (Cr(OH) 3) is amphoteric, dissolving in acidic solutions to form [Cr(H 2 O) 6] 3+, and in basic solutions to form [Cr(OH) 6] 3−. It is dehydrated by heating to form the green chromium(III) oxide (Cr 2 O 3), a stable oxide with a crystal structure identical to that of corundum. [21]
Chromium(II) Cr 2+ bright blue Chromium(III) Cr 3+ blue-green-grey Chromium(III) hydroxide: Cr(OH) 6 3− yellowish Monochromate: CrO 2− 4 yellow Dichromate: Cr 2 O 2− 7 orange Manganese(II) Mn 2+ pale pink Manganese(III) Mn 3+ crimson Manganate(V) MnO 3− 4 deep blue Manganate(VI) MnO 2− 4 dark green Manganate(VII) (permanganate) MnO ...
Viridian (PG18): hydrated chromium(III) oxide Cr 2 O 3 • xH 2 O. Cobalt pigments. Cobalt green: also known as Rinman's green or zinc green (CoZnO 2). Copper pigments. Malachite: cupric carbonate hydroxide (Cu 2 CO 3 (OH) 2). Scheele's Green (also called Schloss green): cupric arsenite (CuHAsO 3). Brunswick green: various pigments, some with ...
The Pourbaix diagram for chromium in pure water, perchloric acid, or sodium hydroxide [1] [2] 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 ...
Chromium(III) oxide is amphoteric. Although insoluble in water, it reacts with acid to produce salts of hydrated chromium ions such as [Cr(H 2 O) 6] 3+. [11] It is also attacked by concentrated alkali to yield salts of [Cr(OH) 6] 3−. When heated with finely divided carbon or aluminium, it is reduced to chromium metal: Cr 2 O 3 + 2 Al → 2 Cr ...
The characteristic bluish-green color of the flame is due to the copper. A flame test is relatively quick test for the presence of some elements in a sample. The technique is archaic and of questionable reliability, but once was a component of qualitative inorganic analysis .
Viridian is a blue-green pigment, a hydrated chromium(III) oxide, of medium saturation and relatively dark in value. It is composed of a majority of green, followed by blue. The first recorded use of viridian as a color name in English was in the 1860s. [2] Viridian takes its name from the Latin viridis, meaning "green". [3]