A 50.00 mL sample of water was collected from a faucet. A 10.00 mL aliquot of this sample was placed in a 25 mL volumetric flask, and diluted to mark. This was then transferred to an Erlenmeyer flask, and was mixed with Eriochrome Black T, and buffered to pH 10. If titration of that sample required 21.27 mL of 0.001645 M EDTA, what is the water hardness, expressed in ppm CaCO3 (100.09 g/mol)

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Chapter1: Chemical Foundations
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A 50.00 mL sample of water was collected from a
faucet. A 10.00 mL aliquot of this sample was placed
in a 25 mL volumetric flask, and diluted to mark. This
was then transferred to an Erlenmeyer flask, and was
mixed with Eriochrome Black T, and buffered to pH
10. If titration of that sample required 21.27 mL of
0.001645 M EDTA, what is the water hardness,
expressed in ppm CaCO3 (100.09 g/mol)?

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