Manufacturer Claim Check
Awaiting data
Enter the manufacturer’s listed CaCO3 and final precipitate mass data to compare the measured calcium with the claim.
Data Entry
Enter the measured values from the gravimetric analysis. Calculated values update instantly as data are entered.
Data Table 1: Initial Tablet and Brand Information
Data
Unit
Manufacturer’s Listed CaCO3
mg
Mass of Tablet
g
Data Table 2: Gravimetric Precipitation Data
Mass
Unit
Mass of clean, dry watch glass + filter paper
g
Mass of watch glass, filter paper, precipitate after 1st heating
g
Mass of watch glass, filter paper, precipitate after 2nd heating
g
Mass of watch glass, filter paper, precipitate after 3rd heating
g
Conclusion Setting
Value
Unit
Acceptable percent-error tolerance
%
Calculations use CaCO3 molar mass = 100.0869 g/mol and Ca molar mass = 40.078 g/mol. The final dry precipitate mass uses the latest entered heating mass, prioritizing the 3rd heating, then 2nd heating, then 1st heating.
Calculated Results
| Calculated Quantity | Value | Unit |
|---|---|---|
| Final dry combined mass used | — | g |
| Mass of recovered CaCO3 precipitate | — | g |
| Moles of recovered CaCO3 | — | mol |
| Experimental calcium in tablet | — | g Ca |
| Manufacturer-claimed calcium from listed CaCO3 | — | g Ca |
| Mass percent CaCO3 in tablet | — | % |
| Percent error versus manufacturer claim | — | % |
| Mass difference: 2nd heating − 1st heating | — | g |
| Mass difference: 3rd heating − 2nd heating | — | g |
Conclusions
Constant Mass Check
Awaiting data
Enter repeated heating masses to evaluate whether the re-dry difference is less than 0.10 g.
Tablet Composition Check
Awaiting data
Enter tablet mass and precipitate data to calculate the mass percent CaCO3 in the tablet.