Textbook Problem

A traditional analysis for samples containing calcium ion was to precipitate the calcium ion with sodium oxalate $\left({\text{Na}}_2{\text{C}}_2{\text{O}}_2\right)$solution and then to collect and weigh either the calcium oxalate itself or the calcium oxide produced by heating the oxalate precipitate:

:math> Ca 2 + ( a q ) + C 2 O 4 2 − ( a q ) → CaC 2 O 4 ( s )

ppose a sample contained 0.1014 g of calcium ion. What theoretical yield of calcium oxalate would be expected? If only 0.2995 g of calcium oxalate is collected, what percentage of the theoretical yield does that represent?