quant lab6.docx - Analysis Identifying Information File...

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Analysis Identifying InformationFile Number: 6Analyst: Obinna EmehAgency: The Department of Chemistry and Biochemistry, Lamar UniversityAddress: PO Box 10022, Beaumont, TX 77710-0022Date: November 1st, 2017Sample Identifying InformationSample Number: 6Received Date: November 1st, 2017Requester Name: Dr. Richard LumpkinBackgroundWe will be titrating EDTA with Mg to test the concentration and learn the concepts of displacement.Materials: 4mM Mg2+solution, 0.01M EDTA titrant solution, NH3/NH4+, ph 10 buffer, Calmagite indicator, 2400ppm CaCO3stock solution, flask, beaker, burette.Test Method and ResultsWe diluted 25mL of 2400ppm solution we pipetted in a 100ml volumetric flask to the mark. After, we added 25mL of distilled H2O with added 2mL of 4mM Mg2+we pipetted and 12 drops of indicator solution. NH3/NH4+buffer was added until the pH probe measured the a pH of 10 for the solution. ppm = massCaCO3massCaCO3+Mass H2O*1E-6mass (CaCO3 solution) = 25mL * 1g/mL = 25g CaCO3solutionmass(CaCO3) = (2400*10-6) * 25g = 0.060g CaCO3mols (CaCO3) = 0.060g100.09g

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