5. (Adapted from question 9-37 in Harvey about measuring calcium in eggshell using EDTA titration.) After removing the membranes from an eggshell, the shell is dried and its mass recorded as 5.754 g. The eggshell is transferred to a 250-mL beaker and dissolved in 25 mL of 6 M HCl. After filtering, the solution containing the dissolved eggshell is diluted to 250 mL in a volumetric flask. Three separate 25.00-ml aliquots are placed in 125-mL Erlenmeyer flasks and buffered to a pH of 10 and CalMagite indicator is added. Titrating with 0.004988 M EDTA (containing Mg2+ so that a blank is not needed) requires an average of 44.11 mL to reach the end points. Determine the mass of calcium (AW 40.08) in the eggshell and then express the result as mass % for both Ca and CaCO3 (MW 100.1).

5. (Adapted from question 9-37 in Harvey about measuring calcium in eggshell using EDTA titration.) After removing the membranes from an eggshell, the shell is dried and its mass recorded as 5.754 g. The eggshell is transferred to a 250-mL beaker and dissolved in 25 mL of 6 M HCl. After filtering, the solution containing the dissolved eggshell is diluted to 250 mL in a volumetric flask. Three separate 25.00-ml aliquots are placed in 125-mL Erlenmeyer flasks and buffered to a pH of 10 and CalMagite indicator is added. Titrating with 0.004988 M EDTA (containing Mg2+ so that a blank is not needed) requires an average of 44.11 mL to reach the end points. Determine the mass of calcium (AW 40.08) in the eggshell and then express the result as mass % for both Ca and CaCO3 (MW 100.1).

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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