A 50.00-mL aliquot of a solution containing iron (II) and iron (III) required 10.98mL of 0.01500 M EDTA when titrated at pH 2.0 and 23.70mL when titrated at pH 6.0. Calculate the molar concerntrations of iron (II) and iron (III); (Hint titration of Iron (III) forms a very stable complex with EDTA even at low pH values)
