Let’s say the % concentrations of CaCO 3 (Table 6 lab results) you obtain from t

Question

Let’s say the % concentrations of CaCO3 (Table 6 lab results) you obtain from trial #1 and #2 are in good agreement. These two trials were run as described in the lab manual without any problems you can assume the pressures and temperatures were measured correctly. For trial #3, consider a small leak occurring after the addition of HCl to the standard calcium carbonate/antacid (you can assume the initial pressure is measured correctly but the final pressure is not). How would this impact the % concentration of CaCO3 calculated? Consider separately both a leak occurring during the trial #3 with the standard CaCO3, and trial #3 with the unknown antacid. Explain in detail your rational.

Explanation / Answer

CaCO3 + 2HCl ---> CaCl2 + CO2 + H2O

If in trial 3, we have a leak, some part of the released CO2 will be lost

therefore,

mass of CaCO3 calculated would be lower and thus percentage CaCO3 in sample would also be lower than actual value

Same is true for unknown sample with leak.

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