The cell (-)SCE || Ag₂CrO₄ (saturated),CrO₄^2- |Ag(+) is employed for

The cell （-)SCE || Ag₂CrO₄（saturated),CrO₄^2-|Ag（) is employed for

The cell (-)SCE || Ag₂CrO₄(saturated),CrO₄^2-|Ag() is employed for the determination of pCrO₄^2-. Calculate pCrO₄^2-when the cell potential is 0.402 V.