A solution of chromium(III) ions is reacted with sodium hydroxide. Initially, a precipitate is formed, but excess amounts of sodium hydroxide yield green hexahydroxochromate(III) ions. When hydrogen peroxide is added in the presence of heat, the distinctive yellow color of the chromate ion can be seen. After cooling, the addition of concentrated sulfuric acid further oxidizes the chromium, yielding orange dichromate ions.
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jack1136 1 year ago