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Unformatted text preview: Since we calculated the HCl millimoles, we just divided it by two to find the millimoles of CaCO3. Then we multiplied the millimoles by the mass of CaCO3. The two calculated masses of CaCO3 were .523919 and .563006; the average of these two is . 5434625. Compared to the 500 mg that is supposed to be in each tablet, there is more CaCO3 in each tablet than the supposed amount. Balanced equation: Some sources of error could have resulted from overheating the flask when dissolving the antacid tablet in HCl. Another source of error could have resulted from the NaOH reacting with CO2 in the air producing H2CO3. H2CO3 dissociates to produce more H+ concentration in solution. The first error could have created an incorrect concentration of CaCO3 because some of the HCl could have evaporated out of the flask. The second error could have created the same issue....
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- Spring '07
- Van Koppen