When 50.00 mL of tap water was titrated with 0.00500 M EDTA, 13.75 mL were required to reach the Eriochrome T endpoint. Calculate the “hardness” of this water. The EDTA will react with both the [Ca2+] + [Mg2+] in the water. The units of hardness are expressed as mg CaCO3/L (assume all moles are Ca2+, which is therefore equal to moles CaCO3)

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