2) In order to determine the hardness of water, 100 mL sample is taken. After neutralizing the sample, pH 10 buffer solutions and Erichrom black-T indicator are added. This sample is titrated with 10.7 mL of the solution containing 3.7225 g EDTA in 1 L distilled water. Calculate the hardness of water in terms of considering the amount of CaCO3 present in the sample. (Mwt Ca:40 g/mole, 0:16 g/mole, C:12 g/mole, EDTA: 372,25 g/mole)

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