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17 Nov 2019
An analyst measured the total hardness of a water sample to be 1.50 mM. To a 50.00 mL aliquot of the water sample, the analyst added 10.00 mL of 0.0100 M BaCl_2 so that all of the SO_4^2- was precipitated out as BaSO_4. The excess Ba^2+ was then titrated with 0.00500 M EDTA. If it took 18.28 mL of EDTA to reach the endpoint, what is the molarity of SO_4^2- in the water sample? What is this concentration in ppm (mg/L)?
An analyst measured the total hardness of a water sample to be 1.50 mM. To a 50.00 mL aliquot of the water sample, the analyst added 10.00 mL of 0.0100 M BaCl_2 so that all of the SO_4^2- was precipitated out as BaSO_4. The excess Ba^2+ was then titrated with 0.00500 M EDTA. If it took 18.28 mL of EDTA to reach the endpoint, what is the molarity of SO_4^2- in the water sample? What is this concentration in ppm (mg/L)?
Nestor RutherfordLv2
17 Nov 2019