Question:
Discuss the method of preparation of potassium dichromate from chromite ore and write the structural formula of dichromate ion.
Discuss the method of preparation of potassium dichromate from chromite ore and write the structural formula of dichromate ion.
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Potassium dichromate is obtained by oxidation of chromite ore in an alkaline medium followed by acidification.
Updated On: Mar 5, 2025
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Solution and Explanation
Step 1: Preparation Steps:
\[
4 FeCr_2O_4 + 8 Na_2CO_3 + 7 O_2 \rightarrow 8 Na_2CrO_4 + 2 Fe_2O_3 + 8 CO_2
\]
\[
2 Na_2CrO_4 + H_2SO_4 \rightarrow Na_2Cr_2O_7 + Na_2SO_4 + H_2O
\]
Step 2: Structural Formula of Dichromate Ion:
\[
[\text{Cr}_2O_7]^{2-}
\]
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