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if 50ml of a sample of hard water consumed 15 ml of 0.01M-EDTA.what is the hard ness of water

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Moles of ETDA=.015*.01=1.5e-4
assuming moles ETDA=moles Hardness
grams CaCO3= it is 1.5e-4*100=.015 g/liter or 15mg/liter or 15ppm

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