Total Hardness is typically reported in units of mg/I. as CaCO3. that is, as if

Question

Total Hardness is typically reported in units of mg/I. as CaCO3. that is, as if all of the hardness would he policed hy an equivalent concentration of only CaCO3. Demonstrate that I ml of the titrating solution, standardized EDTA 00100 M (+0.0001), is equal to 1mg of CaCO3 (use MW of CaCO3-100 g/mol) Use ONLY the following fact: The definition of "equivalent point" of a titration the moment when the titrant (EDTA) is added in amounts equal to the number of moles of substance being analyzed ("hardness") present in the sample. The equivalence point of the reaction of EDTA with the analyte ("hardness") is 1.1

Explanation / Answer

From the data given

1 mole of Ca2+ = 1 mole EDTA

EDTA concentration = 0.01 M

so that, concentration of CaCO3 = 0.01*100

          = 1 gram/L

          = 1000 mg/L

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