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A 50.00-mL sample of groundwater is titrated with 0.0500 M EDTA. Assume that Ca2 accounts for all of the hardness in the groundwater. If 10.10 mL of EDTA is required to titrate the 50.00-mL sample, what is the hardness of the groundwater in molarity and in parts per million of CaCO3 by mass?

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