Potassium Dichromate Oxidation

Question

In acidic medium, Cr2O7²⁻ acts as an oxidizing agent reducing to:

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1. **Starting State**: In Dichromate ($Cr_2O_7^{2-}$), Chromium is in the **$+6$** oxidation state.
2. **The Reaction (Acidic)**: $Cr_2O_7^{2-} + 14H^+ + 6e^- 	o 2Cr^{3+} + 7H_2O$.
3. **Observation**: The orange solution of dichromate turns **green** due to the formation of hydrated $Cr^{3+}$ ions.
4. **Stability**: $+3$ is the most stable oxidation state for Chromium in aqueous acidic solution.
5. **Usage**: This reaction is used in laboratory titrations and in breathalyzer tests for alcohol.

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Potassium Dichromate Oxidation

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