Alka Seltzer Strength Experiment 1: Determining the Nature of the Reaction 1. Based on the Background information, what product of the reaction causes the bubbling to occur when Alka-Seltzer is added to an acid? Carbox Dioxide 2. Based on the Background information, what component of Alka-Seltzer reacts with the HCl and the vinegar? Write its name and chemical formula. Sodium Bicarbonate (NaHCO3) 3. Use the Background information and Chapter 4 in your textbook as a reference to write balanced equations (including physical states) for the reactions you observed: (a) Write a balanced equation for the reaction of solid sodium bicarbonate with HCl(aq). NaHCO3 + HCl --> H2O + CO2 + NaCl (b) Write a balanced equation for the reaction of solid sodium bicarbonate with the acid that’s in vinegar, acetic acid, HC2H3O2(aq). NaHCO3 + HC2H3O2 --> H2O + CO2 + NaC2H3O2 4. Explain why the other components of Alka-Seltzer (described in the Background in LNLs) should not react with HCl or vinegar to product a gas. The other components of Alka-Seltzer do not react with HCl and Vinegar because the other components are acids. The neutralization reaction only occurs between an acid and a base. 5. Fill in the table below with your recorded data and calculated results for Experiment 1. BEAKER (1) Initial Mass # (g) (2) Final Mass (3) Mass CO2 evolved (g) (g) (4) Moles CO2 evolved (mols) 1 124.00 122.82 1.78 0.04045 2 124.007 122.916 1.77 0.04022 Column 1: This initial mass (before reaction) is the measured mass of the beaker containing the water and vinegar PLUS the mass of the Alka-Seltzer tablet (4.000 g). Column 2: This final mass is the measured mass of each beaker with its solution after the reaction between the Alka-Seltzer with the vinegar and water. Column 3: Calculate the mass of CO2 evolved in each beaker by subtracting the final mass from the initial mass. Show calculation for Beaker #1 here. Column 4: Convert the mass of CO2 evolved (column 3) to moles of CO2 evolved. Write the value and show calculation for Beaker #1 here. 6. Which of the following statements is true? Circle or highlight your choice. A. The mass of the CO2 gas evolved should be equal to the mass of the Alka-Seltzer tablet. B. The mass of the CO2 gas evolved should be equal to the mass of the NaHCO3 in the Alka-Seltzer tablet. C. The moles of the CO2 gas evolved should be equal to the moles of the NaHCO3 (in the AlkaSeltzer tablet) that reacted. D. The moles of the CO2 gas evolved should be greater than the moles of the NaHCO3 (in the AlkaSeltzer tablet) that reacted. E. The moles of the CO2 gas evolved should be less than the moles of the NaHCO3 (in the AlkaSeltzer tablet) that reacted. Experiment 2: Determining the Percent-By-Mass NaHCO3 in Alka-Seltzer Be sure to report all data and calculated results with the correct number of significant figures. 7. Fill in the table below with your recorded data and calculated results. More descriptive instructions for each column are below the chart. For some of the columns you’ll need to show a sample calculation. BEAKER (1) Initial Mass (2) Final Mass (3) mass (4) moles (5) moles of (6)mass of # (g) (g) CO2 evolved CO2 NaHCO3 NaHCO3 (g) evolved reacted reacted (g) (mols) (mols) 1 124.000 g 123.090 g 0.91 g 0.02068 0.02068 1.737 g mols mols 2 124.007 g 122.994 g 1.013 g 0.02302 0.02302 1.934 g mols mols 3 124.013 g 122.898 g 1.115 g 0.02534 0.02534 2.129 g mols mols 4 124.020 g 122.842 g 1.178 g 0.02677 0.02677 2.249g mols mols 5 124.027 g 122.849 g 1.178 g 0.02677 0.02677 2.249 g mols mols 6 124.033 g 122.856 g 1.179 g 0.02675 0.02675 2.247 g mols mols 7 124.040 g 122.862 g 1.178 g 0.02677 0.02677 2.249 g mols mols 8 124.047 g 122.869 g 1.178 g 0.02677 0.02677 2.249 g mols mols 9 124.053 g 122.876 g 1.177 g 0.02674 0.02674 2.246 g mols mols Column 1: This initial mass (before reaction) is the measured mass of the beaker containing the water and vinegar PLUS the mass of the Alka-Seltzer tablet (4.000 g). Column 2: This final mass is the measured mass of each beaker with its solution after the reaction between the Alka Seltzer with the vinegar and water. Column 3: Calculate the mass of CO2 evolved in each beaker by subtracting the final mass from the initial mass. Show calculation for Beaker #9 here. Column 4: Calculate the number of moles of CO2 evolved in each beaker. show calculation for Beaker #9 here. Write the value and Column 5: Calculate the number of moles of NaHCO3 that reacted in each beaker. Write the value and show calculation (or explain your answer) for Beaker #9 here. Column 6: Calculate the mass of NaHCO3 that was used up in the reaction for each beaker. Write the value and show calculation for Beaker #9 here. 8. Create a graph with nine data points by plotting the mass of reacted NaHCO3 in each beaker (y-axis) against the volume of vinegar (x-axis). Include distinct data points on the graph. Insert Graph Here 9. Use the graph of your results to answer the following questions: (a) Which trials (beaker numbers) can you use to calculate the amount of NaHCO 3 that reacted? (b) In which trials (beaker numbers) was NaHCO3 the limiting reactant? (c) Which trials (beaker numbers) can you use to calculate the amount of NaHCO 3 present in the AlkaSeltzer samples? (d) What is the mass of NaHCO3 in an Alka-Seltzer tablet? Explain how you arrived at your result. (e) What is the percent-by-mass composition of NaHCO3 in the Alka-Seltzer tablet? Show your calculation here. (f) Explain why the %NaHCO3 value you calculated in the previous question is a good measure of antacid strength.
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