CCllected \begin{tabular}{|l|c|} \hline Volume sodium carbonate (mL) & 97.0 \\ \hline Molarity sodium carbonate (M) & 0.20 \\ \hline Volume calcium chloride (mL) & 100.0 \\ \hline Molarity calcium chloride (M) & 0.20 \\ \hline Observations & \\ \hline It changed colors. & \\ \hline Mass filter paper (g) & 0.28 \\ \hline Mass filter paper + precipitate (g) & 2.11 \\ \hline \end{tabular} Calculated Observed mass calcium carbonate (g) Expected mass calcium carbonate (g) Percent yield (\%)