9.EDTA solutions of a known concentration are used to determine water hardness.These solutions are standardized using oven-dried calcium carbonate (CaCO3).Calcium carbonate reacts with EDTA according to the equation:Ca^2 EDTA^2- ↔ CaEDTA^2- 2H^ If 25.0 mL of a 0.50 M EDTA stock solution was needed to reach an endpoint,determine the mass of oven-dried calcium carbonate (CaCO3) used in thetitation.10.Acid is required for calcium carbonate to fully dissociate according to theequations:CaCO3 ↔
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