question 3 234 Experiment 28 Determination of the Hardness of Water 3. A 100ml s

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question 3

234 Experiment 28 Determination of the Hardness of Water 3. A 100ml sample of hard water is titrated with the EDTA solution in Problem 2. The same amount of Mg?" is added as previously, and the volume of EDTA required is 31,.84 ml a. What volume of EDTA is used in titrating the Ca in the hard water? ml h. How many moles of EDTA are there in that volume moles c. How many moles of Ca are there in the 100 ml. of water? moles d. If the Ca comes from CaCo, how many moles of Caco, are there in one liter of the water? How many grams of CaCO, are present per liter of the water? mol / L g /L e. If 1 ppm CaCO, I mg per liter, what is the water hardness in ppm CaCO,? ppm CaCO

Explanation / Answer

1 a) moles of CaCO3 3.94E-03 moles 1 b) molarity of Ca+2 in 250ml 1.58E-02 M 1 c) moles of Ca+2 in 25ml aliquote 3.94E-04 moles 2 a) ml of EDTA needed to titrate Ca+2 in the aliquote 36.27 ml 2 b) moles of EDTA in the volume 3.94E-04 moles 2 c) Molarity of EDTA solution 1.09E-02 M 3 a) Volume of EDTA required for 100 ml hard waterCa+2 147.85 ml 3 b) Moles of EDTA in the volume 1.61E+03 moles 3 c) moles of Ca+2 in 100 ml hard water 1.58E-03 moles 3 d) moles of CaCO3 in one L 1.58E-02 moles/l g of CaCO3 in 1 L 1.58 g/l 3 e) hardness of water in ppm 1578.4 ppm

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