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Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ

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Precipitation of hexavalent chromium

Why hexavalent chromium cannot be precipitated by hydroxide? Any explanation for this.

ABDUL RAHMAN BIN AWANG
- KUCHING, SARAWAK, MALAYSIA
2003

Hexavalent chromium is soluble even at high pH, so hydroxide will not precipitate it. It must first be reduced to the trivalent state by the addition of materials like sodium metabisulphite. I am not suggesting that you attempt it, I am answering a student question about theory.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
2003

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