Chromium and Dichromate Ions Uses

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.

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.