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To calculate the molar mass of the CO2 gas created, we need to know its mass. Assume on Alka-Seltzer tablet has 50% by mass of each reactant. Use the mass of the tablet from your lab data, and, along with stoichiometric ratios and limiting reactant calculations from our moles unit, calculate the mass of CO2 gas that should have been created in the lab activity.

 
  

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Related questions

1. Fill in the chart below with appropriate data andcalculations. More descriptive instructions as to how toappropriately fill in each column are below the chart.


2. Column 1: Record the mass of the beaker plus the water andvinegar.

Beaker # (1) Beaker (+water, vinegar) Mass [g] (2) Initial Mass[g] (3) Final Mass [g] (4) Mass of CO2 evolved [g] (5) Moles of CO2evolved (6) Moles of NaHCO3 consumed (7) Mass of NaHCO3 consumed[g]

(1)beaker (2) H20+vinegar mass (3) Initial mass (column 2 + 3galka seltzer) (4) final mass

1 115g 118g 117.31g

2 115.005g 118.003g 117.241g

3 115.011g 118.011g 117.164g

4 115.016g 118.016g 117.133g

5 115.021g 118.021g 117.138g

6 115.027 g 118.027g 117.143g

3. Column 2: Add the mass of the Alka Seltzer tablet (3.0g) tothe result of Column 1. This is the initial mass.

4. Column 3: Record the mass of the beaker with its solutionafter the reaction between the Alka Seltzer with the vinegar andwater. This is the final mass.

5. Column 4: Calculate the mass of CO2 evolved in each beaker bysubtracting the final mass from the initial mass.

6. Column 5: Calculate the number of moles of CO2 evolved ineach beaker. The molecular weight of CO2 is 44.01 g/mole CO2.

7. Column 6: Calculate the number of moles of NaHCO3 thatreacted in each beaker. (The molar ratio between evolved CO2 andthe bicarbonate, HCO3-, is 1:1).

8. Column 7: Calculate the mass of NaHCO3 that was used up inthe reaction for each beaker. The molecular weight of NaHCO3 is84.007 g/mole.

9. Draw a graph by plotting the mass of reacted NaHCO3 in eachbeaker (y-axis) against the volume of vinegar (x-axis).

10. From the graph of your results, what is the mass of NaHCO3in an Alka Seltzer tablet? What is the percent mass of NaHCO3 in anAlka Seltzer tablet? What is the percent mass of NaHCO3 in an AlkaSeltzer tablet?

11. For each data point on your graph, indicate which reactantis limiting and which is in excess. Vinegar Volume [mL] LimitingExcess 0 2 4 6 8 10

Alka Seltzer is an effervescent tablet that contains aspirin (acetylsalicylic acid), citric acid, and sodium bicarbonate (NaHCO3). As soon as the tablet dissolves in water, the NaHCO3 dissociates to form a bicarbonate ion (HCO3-) and a sodium ion (Na+)

1. NaHCO3(s) --> Na+(aq) + HCO3-(aq)

Acitic acid, which will ‘donate’ H+ to water to create H3O+(aq) is then added to the mixture. With the addition of acetic acid the following acid-base reaction then takes place:

2. HCO3-(aq) + H+(aq) --> H2O(l) + CO2 (g)

1.Based on your plot (from analysis section). Hint – Consider the reaction equation and vinegar is a source of H3O+ ions.

a) At what range of volumes of vinegar is H+ the limiting reactant?

b) At what range of volumes of vinegar is HCO3- the limiting reactant?

2. Based on your data and your plot, what is the percent by mass of NaHCO3 in the average Alka Seltzer tablet? Show any calculations used to determine your answer. Remember to average only the HCO3- limited range.

3. How might this product reduce indigestion or heartburn?

4. Mass can neither be created nor destroyed. If solution decreases in mass where did this “lost” mass go?

5. Would it be possible to do a similar experiment by measuring the volume of CO2 generated? Explain in detail.

Perform all calculations to the correct number of significantfigures and show all work. Vapor pressures of water are given inthe table in the experiment.

Question:1
If an Alka-Seltzer tablet contained 316 mg of aspirin, 1.927 x1003 mg of sodium hydrogen carbonate (also known assodium bicarbonate), and 1.0008 x 1003 mg of citric acidand nothing else, what is the percent, by mass, of sodium hydrogencarbonate in the tablet?






Question:2
Using the tablet information from Question 1, calculate the molesof CO2 you would theoretically expect from 0.273 gramsof an Alka-Seltzer tablet at 720. torr and 286 K.






Question:3
You conduct an experiment where N2 is collected overwater in a 2.33 L flask at 18oC. At the conclusion ofthe experiment, the total pressure in the flask is 412 torr. Whatis the pressure of N2 in the flask?






Question:4
A student reacted a sample of NaHCO3 with acid under thesame conditions that will be used in lab. The total volume of gascollected plus the correction factor was 53.8 mL at a totalpressure of 674 torr and 21oC. How many moles ofCO2(g) were produced?




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