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  • Describe the oxidising action of potassium dichromate and write the ionic equations for its reaction with: iron

8.15    Describe the oxidising action of potassium dichromate and write the ionic equations for its reaction with:

              (ii) iron(II) solution

 

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Potassium dichromate react with (Fe^{2+}) ion to produce solution of  (Fe^{3+}) ion and chromium reduced to +3 oxidation state.
\\Cr_{2}O_{7}^{2-}+14H^{+}+6e^{-}\rightarrow 2Cr^{3+}+7H_{2}O\\ Fe^{2+}\rightarrow Fe^{3+}+e^{-}]\times 6

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\\Cr_{2}O_{7}^{2-}+14H^{+}+Fe^{2+}\rightarrow 2Cr^{3+}+7H_{2}O+ 6Fe^{3+}

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manish

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