After removing the membranes from an eggshell, the shell is dried, and its
mass is recorded as 11.226 g. The eggshell is dissolved in 50 mL of 6 N HCI.
After filtering, the solution containing the dissolved eggshell is diluted to 500
mL in a volumetric flask. A 20.00-mL aliquot is transferred into an
Erlenmeyer flask and buffered to a pH of 10. Titrating with 0.02494 N EDTA
requires 22.06 mL to reach the end point. Determine the amount of calcium
in the eggshell as %w/w CaCO3.