Calcium Carbonate Analysis; Molar Volume of Carbon Dioxide

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Experiment 13: Calcium Carbonate Analysis; Molar Volume of Carbon Dioxide

Abstract: The goal of this experiment was to determine the percent calcium carbonate in a heterogeneous mixture and to determine the molar volume of carbon dioxide gas at 273 K and 760 torr. This is done by constructing a gas generator to collect the CO2 gas evolved from the reaction. The masses of the sample in the gas generator before and after the reaction are measured. The volume of CO2 gas is also collected and measured. As a result, we found that 25L of CO2 was collected, and after further calculations the molar volume turned out to be 13.28L which is very close to the estimated 22.4 L at STP.
Introduction: In order to fully grasp the goal of this experiment certain terms need to be understood. Molar volume is the volume occupied by one mole of gas at a defined temperature and pressure condition. In this experiment the percent calcium carbonate in a heterogeneous mixture will be determined. A heterogeneous mixture is a non uniform mix of two or more substances often times in different phases. In this experiment the element Calcium carbonate is used, it is the most prevalent simple inorganic compound in the Earth’s crust. Its common name is limestone and is used for chalk, marble, shells of shellfish and caliche. Another term that is prevalent in this experiment is STP. STP is standard temperature and pressure which is 273K (0 C) and 1atm (760torr). At STP the molar volume of CO2 is 22.4L a result close to this number is the ultimate goal, but because carbon dioxide is not an ideal gas there is a possibility that the molar volume may vary. In regards to collecting the volume of carbon dioxide at STP one must keep in mind Dalton’s law of pressures. This law states that the total pressure exerted by a mixture of gases is the sum of the individual pressures exerted by each of the…...

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