4. An indicator in an ammonia buffer medium for titration of an aliquot volume of hard water of 50.00 ml in the presence of arsenazo I, 15.00 ml of 0.0100 m EDTA were consumed. It is for such an aliquot in excess NaOH for titration in the presence of added and indicator calcein that 10.00 ml of 0.0100 m EDTA were consumed. Calculate: a) the molar concentration of magnesium and calcium ions in water; b) the total hardness expressed as CaCO3 (mg/l),

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