Carbon dioxide formula mass12/28/2023 Calculate the mass of CO2 evolved for Trial 1 above, then click here to check your answer.ģ. For the table of data above, the mass of carbon dioxide evolved represents the difference between the (mass of beaker, tube, HCl, sample before reaction) and the (mass of beaker, tube, HCl, sample after reaction). The mass of CO2 evolved represents the change in mass before and after the reaction (i.e., when the acid was transferred from the pipet to the carbonate sample). Using the data above, calculate the mass of carbonate sample for Trial 1, then click here to check your answer. The mass of carbonate sample added to the test tube for Trial 1 will be the difference in mass between the (mass of beaker, tube, HCl, sample before reaction) and the (mass of beaker, tube HCl). For example, if a carbonate sample decreases in mass by 0.2571 g when treated with acid, then the sample must have contained the following amount of carbonate ion: In this experiment, we determine how much carbonate ion is present in a sample by measuring the loss in mass (which represents the CO2 that escapes) when acid is added to the sample. When a compound containing the carbonate ion is treated with an acid, the following net reaction occurs:ĬO2 is a gas and is lost from the carbonate sample when the acid is added to the sample. If you are not careful in this experiment, or if you hurry the experiment because it seems so "easy" to perform, you will receive poor agreement between your three determinations and you will receive a poor grade on your lab report. Although you will make three determinations of your sample, realize that the percent carbonate calculated for your sample should be the same (within reasonable experimental error) for each of the determinations. In this experiment you will be given a sample of an "unknown" carbonate, and you will determine what percentage (by mass) of carbonate ion the compound contains. "Carbonates" are compounds which contain the carbonate ion, CO32.
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