Question

) Chromate/Dichromate Equilibrium. Yellow chromate ion reacts with hydrogen ion to form (by condensation and loss of H2O) the orange dichromate ion:

Answer 1

Step-by-step explanation:

The Chromite ore is used for the production of Chromate/dichromate formation.

`4FeCr2O4 + 8Na2CrO4+7O2 \\` →
`8NaCrO4 +2Fe2O3 +8CO2\\yellow`

so
`Na2CrO4` is called Chromite ore which is of yellow color.

`Na2CrO4 +2H^+` →
`Na2CrO4 +2Na^+ +H2O`

`Orange`

so when sodium chromate is reacted with hydrogen ion it forms sodium dichromate which is of orange color

Now

`Na2Cr2O7+2KCl`→
`K2Cr2O7 + NaCl`

The chromate and dichromate are interconvertible in aqueous solution depending upon the PH of solution

Acid medium:
`Cr2O4^2-`
`2H^+`→
`Cr2O7^2-`
`+H2O`

Base:
`Cr2O7^2- +2OH^-`→
`CrO4^2- +H2O`

Hence Chromate and dichromate are interconvertible and hold and equilibrium.