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Predict the color change when a base is added into potassium dichromate solution:

A. Yellow to blue ⃝ B. Orange to yellow ⃝
C. Yellow to orange ⃝ D. Green to yellow

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Answer: The correct answer is C. Yellow to orange.

When a base is added to a potassium dichromate (K2Cr2O7) solution, the color change occurs due to the reduction of the chromium(VI) ions (Cr2O7 2-) to chromium(III) ions (Cr3+). The original color of the potassium dichromate solution is yellow-orange.

As the base is added, the solution becomes more alkaline, and the chromium(VI) ions undergo reduction to form chromium(III) ions. This reduction reaction results in a color change from yellow to orange.

Therefore, the correct answer is C. Yellow to orange.

Step-by-step explanation:

User Derrick Tucker
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