Potassium chromate

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Specification

Synonyms: Potassium chromate

Chemical formula: CrK2O4

International name: Potassium chromate

CAS No: 7789006

Appearance: Yellow crystals of the orthorhombic system

Packing: bags of 25 kg

Storage: Store in a dry, well-ventilated area

Potassium chromate - yellow crystals of rhombic system, stable in air. When heated, turns red when cooled again becomes yellow. Potassium chromate is soluble in water (38.9% at 20 ° C) soluble in ethyl alcohol and diethyl ether. An aqueous solution of potassium reagent lame has intense yellow color; the reaction solution was neutral.

Receiving
Potassium chromate (potassium chromate) may be obtained in different ways:
• potassium chromate can be obtained from the action of potassium dichromate, such as potassium carbonate:
K2Cr2O7 + K2CO3 = 2K2CrO4 + CO2b
• pure preparation obtained by neutralization of chromic anhydride in the presence of potassium hydroxide, barium chromate as the inorganic reservoir for co-precipitation of impurities
CrO3 + 2KOH = K2CrO4 + H2O

Application
Potassium chromate is used:
• to prepare solutions of the electrochemical oxidation of silver,
• as a component of the electrolyte composition of chemical degreasing
• for the passivation of silver jewelery and copper alloys
• as a mordant in dyeing fabrics, leather tanning,
• as an oxidant in the manufacture of dyes and others.

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