Question

Exlain Why K2Cr2O7 is orange in acidic and yellow in basic medium.

Answer 1

Answer:

This is because in basic medium, potassium dichromate forms chromate ions which is yellow in colour while in acidic medium forms dichromate ions. Dichro.ate ions are red in colour while chromateions are yellow in colour.

Answer 2

Potassium Dichromate (K2Cr2O7) is orange in acidic and yellow in basic medium.

This is because :

- In basic medium, potassium dichromate forms chromate ions (CrO₄²⁻). These chromate ions are yellow in colour.

- While in acidic medium, potassium dichromate forms dichromate ions (Cr₂O₇²⁻). These dichromate ions are orange in colour.

- These chromate and dichromate ions are interconvertible depending upon the pH of the solution.