The reaction taking place in acidic medium between Fe2+ and Cr2O72− is shown below. Cr2O72−+14H++6Fe2+→2Cr3++7H2O+6Fe3+ The reaction taking place in acidic medium between Fe2+ andMnO4− is shown below. MnO4−+8H++5Fe2+→Mn2++4H2O+5Fe3+ By applying the dilution formula: M1×V1×n1=M2×V2×n2 0.01×20×6=M2×20×5 M2=