**Question 4:**What color would I expect a solution of dichromate ions to be after I add an excess of base? Briefly explain.---**Explanation:**When an excess of base is added to a solution containing dichromate ions, the dichromate (\( \text{Cr}_2\text{O}_7^{2-} \)) ions convert to chromate (\( \text{CrO}_4^{2-} \)) ions. This is due to the increase in pH, which favors the chromate ion form. The color of the solution changes from orange (dichromate) to yellow (chromate). This color change is a classic demonstration of the equilibrium:\[ \text{Cr}_2\text{O}_7^{2-} + \text{OH}^- \rightleftharpoons 2\text{CrO}_4^{2-} + \text{H}_2\text{O} \]Thus, in an alkaline medium, one should expect the solution to be yellow.

Cr2O7^2- is called dichromate. It's colour is orange. When Cr2O7^2- is treated with an excess of…

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What color would I expect a solution of dichromate ions to be after I add an excess of base? Briefly explain.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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