Question

Why potassium dichromate changes color in acidic medium?

Answer 1

Answer:

Explanation:

The solution of potassium dichromate is orange while that of chromate is yellow. ... When we add OH- ion in solution (increasing the pH), it will react with H+ ion present in solution increasing the concentration of H2O.

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Answer 2

As nitric acid is added to the potassium chromate solution, the yellow colour turns to orange. When sodium hydroxide is added to the potassium chromate solution, the orange colour turns back to yellow. Barium reacts with chromate ions (but not dichromate ions) to form an insoluble salt.