How does the colour of K2Cr2O7 solution depends on pH of the solution?

  • K2Cr2O7 is a strong oxidizing agent, which itself gets reduced and oxidizes other compounds. It is orange in color.


Cr2O7-2+H2O ----------> 2CrO4-2+2H+


  • pH <7- Solution is acidic - Orange to yellow due to yellow color of CrO4-2
  • pH >7- Solution is basic - Yellow to Orange.

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Acidic medium-pH <7-Orange to yellow

Basic medium-pH >7-yellow to orange

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becuase it is a stong oxidising agent and in acidic medium it gives yellow colour and in basic medium it gives orange

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