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Questions and Answers
In which industry is dichromate commonly used for tanning leather?
In which industry is dichromate commonly used for tanning leather?
What is formed when acidified potassium dichromate reacts with hydrogen peroxide?
What is formed when acidified potassium dichromate reacts with hydrogen peroxide?
What is the shape of the chromate ion?
What is the shape of the chromate ion?
Which of the following is NOT a use of dichromate?
Which of the following is NOT a use of dichromate?
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What is the oxidation state of chromium in dichromate ions?
What is the oxidation state of chromium in dichromate ions?
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Study Notes
Uses of Dichromate
- Employed in volumetric analysis for redox titrations, specifically to determine ferrous ions and iodides.
- Integral in the leather industry for chrome tanning processes.
- Utilized in the production of multiple chromium compounds, including potassium chromate and chromium trioxide.
- Contributes to processes in calico printing, dyeing, and photography, especially in hardening gelatin film.
- Functions effectively as an oxidising agent in various chemical reactions.
- Potassium dichromate combined with sulfuric acid serves as an effective cleaning agent for laboratory glassware.
Reaction with Hydrogen Peroxide
- In an acidified solution, potassium dichromate reacts with hydrogen peroxide to yield blue perchromate ($CrO_5$).
- The reaction is represented as: $Cr_2O_7^{2-} + 2H^+ + 4H_2O_2 \longrightarrow 2CrO_5 + 5H_2O$.
Structure of Dichromate and Chromate Ions
- Chromate ion features a tetrahedral geometry, characterized by two tetrahedras sharing a Cr-O-Cr bond at an angle of 126°.
- Dichromate ion is composed of two chromate ions linked through a shared oxygen atom.
- Chromium in both the chromate and dichromate ions exhibits an oxidation state of +6.
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Description
Explore the various applications of dichromate ions in different fields. This quiz covers their significance in volumetric analysis, the leather industry, dyeing, photography, and more. Test your knowledge and understanding of these essential compounds.
