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Potassium chromate is the inorganic compound with the formula K 2 CrO 4. This yellow solid is the potassium salt of the chromate anion. It is a common laboratory ...
Potassium hypochromate is a chemical compound with the formula K 3 CrO 4 with the unusual Cr 5+ ion. This compound is unstable in water but stable in alkaline solution [ 1 ] and was found to have a similar crystal structure to potassium hypomanganate .
Chromate containing minerals are rare. Crocoite, PbCrO 4, which can occur as spectacular long red crystals, is the most commonly found chromate mineral. Rare potassium chromate minerals and related compounds are found in the Atacama Desert. Among them is lópezite – the only known dichromate mineral. [10]
The change in equilibrium is visible by a change from yellow (chromate) to orange (dichromate), such as when an acid is added to a neutral solution of potassium chromate. At yet lower pH values, further condensation to more complex oxyanions of chromium is possible. Both the chromate and dichromate anions are strong oxidizing reagents at low pH ...
This page was last edited on 17 September 2019, at 05:02 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.
Chrome alum. Chromium alum is produced from chromate salts or from ferrochromium alloys. Concentrated aqueous solutions of potassium dichromate can be reduced, usually with sulfur dioxide but also with alcohols or formaldehyde, in the presence of sulfuric acid at temperatures <40 °C.
Potassium dichromate is an oxidising agent in organic chemistry, and is milder than potassium permanganate. It is used to oxidize alcohols. It converts primary alcohols into aldehydes and, under more forcing conditions, into carboxylic acids. In contrast, potassium permanganate tends to give carboxylic acids as the sole products.
Potassium chromate – K 2 CrO 4; Potassium cyanide – KCN; Potassium dichromate – K 2 Cr 2 O 7; Potassium dithionite – K 2 S 2 O 4; Potassium ferrate – K 2 FeO 4;