A. Sample Preparation and Setup Apparatus Calculation of mass ofcaco sample for
ID: 1068016 • Letter: A
Question
A. Sample Preparation and Setup Apparatus Calculation of mass ofcaco sample for analysis (from Prelaboratory Assignment, question 2). 40ml .00 Trial 2 Unknown sample no. Trial I 1. Mass of sample (g) 175.3 /73 210 2. Mass of generator sample before reaction (g) Instructor's approval of apparatus C. Determination of volume, Temperature, and Pressure ofthe Carbon Dioxide Gas 5 mL. 1. Initial reading of volume of water in COrcollecting graduated cylinder (ml) 55 mL 2 Final reading of volume of water in co collecting graduated cylinder (ml) 3. Volume of CO(g) collected (L) 4. Temperature of water (e) 5. Barometric pressure (torr) 6 vapor pressure of Hizo at c(torr) Pressure of dry con(g) (torr) D. Amount of Carbon Dioxide Gas Evolved 1. Mass of generator sample after reaction (g) 2 Mass loss of generator mass coh evolved (g) Moles of co, evolved (mo) Experiment 13 187Explanation / Answer
CaCO3 --> CaO + CO2
E.
a. pressure of dry CO2 = 728.2/760 = 0.758 atm
b. Volume of CO2 = 0.03 L
c. molar volume of CO2 = 0.03/0.00254 = 11.86 L/mol
Similarly for trial 2 can be done
F.
a. moles of CaCO3 = 0.00254 mol
b. mass of CaCO3 = 0.00254 x 100.088 = 0.2545 g
c. original mass of sample = 0.1802 g (this value cannot be lower than b.)
d. percent CaCO3 in sample = (0.2545/value from c.) x 100
similarly for trial 2 can be doen to calculate average of the two values