A mixture of 0.01M Calcium Nitrate and 0.01M Sodium Carbonate produced a precipitate and supernatant that were separated by vacuum filtration. The mass of the solid material was determined. Prior to filtration, a watch glass and filter paper which would be used to capture the solid weighed 25.001g. After filtration and drying, the obtained solid product, watch glass and filter paper weighed 25.010g. A second determination (second drying and weighing only) was completed and the mass of that same watch glass, filter paper and solid residue weighed 24.985g. What does this indicate and what needs to be done