Chem-3000-Prelabs-Fall-2009-Prelab-2a

Chem-3000-Prelabs-Fall-2009-Prelab-2a - = 10-3 M? [EDTA] =

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PRE-LABORATORY EXERCISES 3 Experiment 2 Day 1 Prelab Last ________________________________ First _____________________ Email: ___________________@ cornell.edu [ ] Christina Cowman [ ] Yingchao (Alex) Yu [ ] Angela Bruneau [ ] Mon PM [ ] Tues AM [ ] Tues PM [ ] Weds PM [ ] Thurs PM 1. You have prepared a standard calcium solution, following the instructions in Section 2.6.1 of the laboratory manual, starting from 201.9 mg of calcium carbonate (CaCO 3 ). What is the concentration of Ca 2+ in your standard solution, in units of mM = 10 - 3 M? [Ca 2+ ] = ____________________ mM 2. Following the instructions in Section 2.6.3 of the laboratory manual, you transferred 10.00 mL of this standard Ca 2+ solution to an Erlenmeyer flask and titrated it with an EDTA solution. The initial reading on the buret is 18.40 mL and the final reading on the buret is 35.75 mL. What is concentration of the EDTA solution, in units of mM
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Unformatted text preview: = 10-3 M? [EDTA] = ____________________ mM 3. In Section 2.6.4.2, the laboratory manual instructs you to weigh out sufcient solid [antacid tablet] to prepare 100 mL of solution at approximately 0.01 M in Ca 2+ . As instructed in Section 2.6.4 of the laboratory manual, you observe the calcium content reported on the antacid label and nd it to be 500 mg of calcium carbonate per tablet. As instructed in Section 2.6.4.1, you then weigh the antacid tablet and nd the weight of the tablet to be 1309.9 mg. How much of the antacid tablet should you weight out to ultimately produce a 0.01 M in Ca 2+ solution, following the instructions in Section 2.6.4.1 to 2.6.4.4 of the laboratory manual? weight of ground antacid tablet = ____________________ mg Cornell University Chemistry 3000 Fall 2009 J. A. Marohn...
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