A 100mL sample of hard water is titrated with EDTA solution in Problem 2 (0.011M). The volume of EDTA required is 31.84 mL. (36.27 mL was needed to titrate Ca2+ in 25mL aliquots from the previous question.)

What's the volume of EDTA used in titrating the Ca2+ in the hard water?

Also, if the Ca2+ comes from CaCO3, how many moles of CaCO3 are there in 1 L of the water? How many grams of CaCO3 per liter?

What is the hardness of water in ppm CaCO3 of 1ppm CaCO3=1mg per L?