Experiment 13 Report Sheet A Carbonate Analysis: Molar Ve me of Carbon Dioxide Lob Sec Date Nome A. Sample Preparation and Setup Apparatus Calculation of mass of CaCO, sample for analysis (from Prelaboralory Assignmen, question 2) Desk No. Unknown sample no. Trial 2 L Mass of sample (g) Trial I o1300g 2 Mass of generator + sample before reaction (g) 47613123 125s, 3 Instructor's approval of apparatus 222 C. Determination of Volume. Temperature, and Pressure of the Carbon Dioxide Gas 1. Initial reading of volume of water in CO,-collecting graduated cylinder (mL) 31,0m 2 Final reading of volume of water in CO,-collecting 62.4 mL graduated cylinder (ml) 34,0 mL 3 Volume of CO (g) collected (L) 34,p 4. Temperature of water ("C 5 Barometric pressure (torr) 6 Vapor pressure of H,O at C (torr) ANGH hast ost 7. Pressure of dry CO (g) (torr) D. Amount of Carbon Dioxide Gas Evolved St AnttrFtt 0416 0014 1. Mass of generator + sample after reaction (g) A-D 2 Mass loss of generator s mass CO, evolved (g) mol 3 Moles of CO, evolved (mol) Experiment 13 187 110 Trial 2 Triel P E Modar Volume of CO, Gas 2,4234 1. Pressure cf dry CO(e) (atw) See Part C7 2 Volume of CO.ie) at STP () See eqeation 13.4. mol) See equation 13.2 Molar volume of COue) at STP 4. Average moter volume of CO.e) at STP (es F. Percent CaCO, in Mistures 1. Moles of CaCO, in sample from mol CO, generated (moly See equation 13.1. 2. Mass of CaCO, in sample (e) 3. Mass of original sample (g) 4. Percent of CaCO, in sample (%) Average percent of CaCO, in sample (%) 5. Laboratory Questions Circle the questions that have been assigned I. Part A.I. 7he water for the pan (Part A.3) is not saturated with CO,, Will the reported percent CaCO, in the original sample be too high, too low, or unaffected? Explain 2. Part A.2. Suppose 6 M HCI is substituted for the 3 M HCI in the procedure. What would be the consequence of this substitution? Explain. 3 Part A.3. A few drops of HC(ag) spilled over into the CaCO, sample prior to firmly seating the stopper and prior to collecting any CO(e). As a result of this poor technique, will the repor too low, or unaffected? Explain. t CaCO, in the sample be too high, pe 4. Part A.4. The rubber stopper has a small crack resulting in a not-tight seal. How will this affect the calculated molar volume of CO. too high, too low or unaffected? Explain. 5. Part C.I. The water level in the CO-(g)-collection cylinder is higher than the water level outside the cylinder. See margin drawing a. Is the wet CO, gas pressure greater or less than atmospheric pressure? Explain. b. An adjustment is made to equilibrate the water levels. Will the volume of the wet CO, gas increase or decrease? Explain. . The student chemist chooses not to equilibrate the inside and outside water levels. Will the reported number of moles of CO, generated in the reaction be too high, too low, or unaffected by this carelessness? Explain. art C.I. An air bubble accidentally mpletion of the reaction. How does this error affect the reported moles of CO-(g) lected-too high, too low, or unaffected? Explain. enters the CO,-collection graduated cylinder after the If a large 2 is present in the original sample, how does it affect the reported blar volume of the CO,(8)-too high, too low, or unaffected? Explain. cent CaCO, in the sample-too high, too low, or unaffected? Explain. amount of calcium sulfate [it does not form a gas with the addition of wpw.pn