Ap Chemistry †Gravimetric Lab Essay

By filtering and weighing the carbonate after it has striked, the portion and moles of CaCO3 could indeed be found with these values, a torpedo mass of M2CO3 can be found. Using gravimetric analysis, it has been determined that the unvalued Group 1 metal carbonate compound is K2CO3 (potassium carbonate).Experimental Sources of actus reusA) The first source of demerit had to do with the precipitation section of the lab. not only is possible, but it is almost guaranteed that the CaCO3 did not precipitate to its fullest extent. Attaining a precipitate that is c% pure and is exactly of the composition represented by its chemic formula would be extremely difficult. A second source of mistake was in the filter paper. No filter paper can be perfect, and it is very likely that it did not filter all of the precipitate, which would then go down not only the mass of CaCO3, but in like manner the molar mass because only the majority of the correct mass of the precipitate was found by lowering the mass of a compound, its molar mass will also fall.B) After the precipitate had been filtered and dried, the filer paper that contained the precipitate was mishandled and its contents was staccato all over our lab bench. The dried precipitate had to be then gathered and then put back onto the filter paper this contributed a large portion of human erroneous belief to this lab. Spilling the dried precipitate is a source of human because it is almost guaranteed that not all of the precipitate was peaceful that had been spilled. This would have then lowered the mass of all of the following data, and wholly, our supplant result (i.e. molar mass). C) Percent error = your result-accepted valueaccepted value x 100 Percent error = 128.79-138.21138.21 x 100 = 6.8157%Considering that any percent error that is under 5% is often times considered accurate, a percent error of 6.8% can be viewed as fairly accurate. It is not too uttermost off to completely disregard, but it is als o not close luxuriant to use as fact.