Table 1: Amount of H 2 O Displaced for Each Trial-Grams of Solute Used Trial Bar
ID: 521397 • Letter: T
Question
Table 1: Amount of H2O Displaced for Each Trial-Grams of Solute Used
Trial
Barometric Pressure (atm)
Temperature (°C)
Mass of Chemical (g)
Water Displaced (mL)
Trial 1 NaHCO3
1.006978
20.1
1.1g
.059L
Trial 2 NaHCO3
1.006973
20
2.0g
.087L
Trial 3 Na2CO3
1.006973
22
1.2g
.044L
Trial 4 Na2CO3
1.006973
20
1.1g
.036L
Post-Lab Questions
1.What is the average experimental volume per mole of carbon dioxide calculated for sodium carbonate and sodium bicarbonate?
2.List two sources of error in your experiment. What did they affect? Explain how they could have been fixed.
3.Identify two assumptions that must be true when using the ideal gas equation that are not true for real gasses.
4.Why is the air in a hot air balloon heated?
Trial
Barometric Pressure (atm)
Temperature (°C)
Mass of Chemical (g)
Water Displaced (mL)
Trial 1 NaHCO3
1.006978
20.1
1.1g
.059L
Trial 2 NaHCO3
1.006973
20
2.0g
.087L
Trial 3 Na2CO3
1.006973
22
1.2g
.044L
Trial 4 Na2CO3
1.006973
20
1.1g
.036L
Explanation / Answer
1. Experimental moles of CO2 from,
Trial 1 NaHCO3 = 1.006973 x 0.059/0.08205 x 293.1 = 0.0025 mol
Trial 2 NaHCO3 = 1.006973 x 0.087/0.08205 x 293 = 0.0036 mol
Trial 1 Na2CO3 = 1.006973 x 0.044/0.08205 x 295 = 0.0018 mol
Trial 2 Na2CO3 = 1.006973 x 0.036/0.08205 x 293 = 0.00151 mol
Average volume per CO2 moles = (0.059/0.0025 + 0.087/0.0036 + 0.044/0.0018 + 0.036/0.00151)
= 24.01 L/mol CO2
2. Sources of errors in experiment could be by reading the level of water incorrectly which can be reduced by redoing experiment several times and secondly by atmospheric pressure not adjusted correctly with pressure inside the tube, which should also be corrected by readjusting the system.
3. Assumptions according to ideal gas law, the gas molecules does not interact with each other. Volume of gas molecules is small and neligible, the only volume is that occupied by gas mattered.
4. Hot air has lower density and are lighter than cold air and thus it rises in air.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.