Potassium Chromate
K2 Cr O4

{Merck Index - © 1952 by Merck & Co., Inc.}

Potassium Chromate: Neutral potassium chromate. K2CrO4; mol. wt. 194.20. K 40.26%, CrO3 51.50%, available oxygen 12.36%, Cr 26.78%.

Lemon-yellow crystals; d. 2.73; m. 975°. Soluble in 1.6 parts cold, 1.2 parts boil, water; insoluble in alcohol. The aq. soln. is alkaline to litmus or phenolphthalein.

Use: Has a limited application in enamels, finishing leather, rustproofing of metals, being replaced by the sodium salt; as reagent in anal. chemistry.

Grades available: Reagent, technical.

Toxicity: (chromates also): Local ulceration of skin, if contact continues ulcers burrow deeply. Inhaled (dust or mist), irritating to nasal mucosa; inflammation, ulceration, perforation of nasal septum may occur. Ingestion: vomiting, severe diarrhea; kidney damage may occur.


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