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This document describes an experiment to determine water hardness using EDTA titration. The experiment involves standardizing an EDTA solution, then using it to titrate a water sample to determine total hardness and Mg2+ ion hardness. Total hardness is reported in units of mg CaCO3/L and ppm CaCO3. The results would be affected if the deionized water used was contaminated. Ca2+ is a Lewis acid that accepts electron pairs. EDTA is a strong ligand that forms stable complexes with metal ions like Ca2+ and Mg2+

Author

wanbin zhu

Language

EN