Sample Preparation and Setup Apparatus Culculation of mass of CaCO, sample for a
ID: 1046375 • Letter: S
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Sample Preparation and Setup Apparatus Culculation of mass of CaCO, sample for analysis (from Prelaboratory Assignment, question 2), CalO Trial I Unknown sample no. 1. Mass of sample (&) 2. Mass of generator+ sample before reaction (g) 3. Instructor's approval of apparatus c. Determination of Volume, Temperature, and Pressure of the Carbon Dioxide Gas 1. Initial reading of volume of water in CO, collecting Trial 2 rial3 55 22 4.32 a53 a graduated cylinder (mL) .Final reading of volume of water in CO,-collecting 10.2 graduated cylinder (mL.) Volume of CO,(g) collected (L) Temperature of water (C) Barometric pressure (torr) Vapor pressure of H,0 at"C (torr) Pressure of dry CO-(g) (torr) Amount of Carbon Dioxide Gas Evolved Mass of generator +sample after reaction (g) Mass loss of generator = mass CO2 evolved(g) Moles of CO, evolved (mol) 143 torr Experiment 13 187Explanation / Answer
For trial 1:
Mass of sample = 0.18g
Mass of generator + sample before reaction = 55.33g
Mass of generator + sample after reaction = 55.18g
Mass loss of generator = mass of CO2 evolved = 0.15g
Moles of CO2 evolved = 0.15/44 = 0.0034mol
Volume of CO2 collected (L) = 19.6mL = 0.0196L
Temperature of water = 22.4oC = 295.4K
Barometric pressure (or Total pressure) = 743torr
Vapor pressure of H2O at 22.4oC = 19.8 torr
Pressure of dry CO2 = 743 torr - 19.8torr = 723.2 torr
Pressure of dry CO2 = 723.2/760 = 0.95atm
Volume of dry CO2 at STP = (Experimental volume of CO2) x (PCO2 torr/ 760 torr) x (273/experimental TCO2)
Volume of dry CO2 = (0.0196) x (0.95) x (273/295.4) = 0.0172L
Moles of CO2 generated (n) = PV/RT
Moles of CO2 generated (n) = (0.95) x(0.0172)/ (0.0821) x (295.4) = 0.000674 mol
Moles of CO2 generated = 0.000674mol
% error = (0.000674/0.0034) x 100 = 19.8%
There is an experimental error of 19.8%
For trial 2:
Mass of sample = 0.18g
Mass of generator + sample before reaction = 54.32g
Mass of generator + sample after reaction = 54.12g
Mass loss of generator = mass of CO2 evolved = 0.2g
moles of CO2 evolved = 0.2/44 = 0.0045 mol
Volume of CO2 collected (L) = 20.2mL = 0.0202L
Temperature of water = 22.4oC = 295.4K
Barometric pressure (or Total pressure) = 743torr
Vapor pressure of H2O at 22.4oC = 19.8 torr
Pressure of dry CO2 = 743 torr - 19.8torr = 723.2 torr
Pressure of dry CO2 = 723.2/760 = 0.95atm
Volume of dry CO2 at STP = (Experimental volume of CO2) x (PCO2 torr/ 760 torr) x (273/experimental TCO2)
Volume of dry CO2 = (0.0202) x (0.95) x (273/295.4) = 0.0177L
Moles of CO2 generated (n) = PV/RT
Moles of CO2 generated (n) = (0.95) x(0.0177)/ (0.0821) x (295.4) = 0.000693 mol
Moles of CO2 generated = 0.000693mol
% error = (0.000693/0.0045) x 100 = 15.4%
There is an experimental error of 15.3%
For Trial 3:
Mass of sample = 0.18g
Mass of generator + sample before reaction = 53.12g
Mass of generator + sample after reaction = 52.9g
Mass loss of generator = mass of CO2 evolved = 0.22g
Moles of CO2 evolved = 0.005mol
Volume of CO2 collected (L) = 25.7mL = 0.0257L
Temperature of water = 22.4oC = 295.4K
Barometric pressure (or Total pressure) = 743torr
Vapor pressure of H2O at 22.4oC = 19.8 torr
Pressure of dry CO2 = 743 torr - 19.8torr = 723.2 torr
Pressure of dry CO2 = 723.2/760 = 0.95atm
Volume of dry CO2 at STP = (Experimental volume of CO2) x (PCO2 torr/ 760 torr) x (273/exp TCO2)
Volume of dry CO2 = (0.0257) x (0.95) x (273/295.4) = 0.0226L
Moles of CO2 generated (n) = PV/RT
Moles of CO2 generated (n) = (0.95) x(0.0226)/ (0.0821) x (295.4) = 0.000885 mol
Moles of CO2 generated = 0.000885mol
% error = (0.000885/0.005) x 100 = 17.7%
There is an experimental error of 17.7%
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