Acidic and alkaline chromate solutions

Acidic and alkaline chromate solutions

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Credit: TREVOR CLIFFORD PHOTOGRAPHY/SCIENCE PHOTO LIBRARY

Caption: Acidic and alkaline chromate solutions. Image showing the typical colours of two chromate solutions. The dichromate ion (Cr2O7)2- predominates in acidic solution (left) and has a reddish-orange colour, whilst the chromate ion (CrO4)2-, formed in alkaline solutions, has a bright yellow colour.

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