Help needed regarding water hardness
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The hardness of water (expressed in terms of calcium and magnesium) is determined using the EDTA titration method, and it is represented by the CaO content. 1 unit corresponds to 10 mg of CaO per liter of water. The calculation formula for total hardness is: Total hardness = {C(EDTA) × V(EDTA) × M(CaO) / V_water} × 1000 / 10. In the \"Analytical Procedures for Sulfuric Acid Production\" compiled by the Ministry of Chemical Industry, the formula for total hardness (in mmol/L) is: Total hardness = {C(EDTA) × V(EDTA) × 2 / V_water} × 100. What does the number 2 in this formula represent? Generally, there is no calculation formula that doesn’t involve 2. Thank you!
:):) Please help out more!
Both magnesium and calcium are divalent; one molecule binds to two EDTA molecules, right?
Reply to 3# Purple Nameless Rain EDTA is divalent; it is titrated at a ratio of one to one