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)

Q: Calculate a4 and the mole percent of Y* in a solution of EDTA that is buffered to pH 10.20.

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A: Dear Student EDTA is a complexometric ligand and is used in complexometric titrations. EDTA is a…