In the titration of 25.00 ml of a water sample, it took 19.790 ml of 3.630x10-3 M EDTA solution to reach the endpoint. Complete the questions below:
The total hardness is due to one or a combination of Ca2+, Mg2+, and Fe2+ in your sample. It is convenient to express this hardness as though it was entirely due to Ca2+. Making this assumption, determine the number of moles of Ca2+ present in the bottled water sample titrated. (enter your answer with 3 significant figures)