Chromium hydroxide precipitate

Chromium hydroxide precipitate

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Caption: Chromium hydroxide precipitate formed by adding sodium hydroxide (NaOH) to a solution containing chromium ions. The simplest chromium ion in solution is the hexaaquochromium ion (Cr(H2O)6). When NaOH is added chromium hydroxide (Cr(H2O)3(OH)3) is precipitated out of solution as a pale grey/green solid. Excess NaOH causes a further change to the chromite ion (CrOH6) in a dark green solution. Addition of sodium hydroxide is used as a test for positive metal ions in solution.

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Keywords: alkaline, analysis, analytical, apparatus, chemical, chemistry, chromite, chromium hydroxide, complex, experiment, glassware, hexaaquochromium, insoluble, ions, laboratory, precipitate, precipitating, precipitation, reacting, reaction, salt, sodium, solid, solution, test, test tube, testing

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