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Christian AzalekorL20352441Determination of Water Hardness by EDTA TitrationPurpose:Students will use EDTA titration to measure the total concentration of Ca2+and Mg2+in water and determine water hardness of a 15 mL unknown and report if the unknown is “hard” or “soft” water.Materials:4 mM Mg2+solution, M EDTA titrant solution, NH3/NH4+, pH 10 buffer, calmagite indicator, 2400 ppm CaCO3stock solution, pipet,100 mL volumetric flask, Erlenmeyer flasksbeakers, buret,pH paperProcedure:1.Preparing a working standard solution of 600 ppm CaCO3
a.Prepare by pipetting 25 mL of 2400 ppm CaCO3solution into a 100 mL volumetric flask. Dilute to the mark with distilled water and mix well.2.Performing a blank correctiona.Add approximately 25 mL of distilled water into an Erlenmeyer flask.b.Pipet exactly 2 mL of 4 mM Mg2+solution, add 12 drops of calmagite indicator, and add enough NH3/NH4+until the pH of the solution is about 10 (approximate via pH paper).

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