Question

K2Cr2O7 is orange in acidic and yellow in basic medium why?Explain?

Answer 1

Answer:

The color change depends on the changes in the pH of the solution. Dichromate salts contain the dichromate anion, Cr2O72- and chromate salts contain chromate anion, CrO42−. The chromate ion (yellow) is the predominant species in alkaline solutions, dichromate (orange) predominant in acidic solutions.

Answer 2

Answer:

K2cr2o7is basically orange in colour . in acidic med. It's colour changes from orange to yellow due to formation of chromate (cro4-2) while in basic med. It again changes from yellow to orange.