Understanding Alka-Seltzer Reaction: Data Collection & Analysis
School
Liberty University Online Academy**We aren't endorsed by this school
Course
CHEMISTRY 11
Subject
Chemistry
Date
Dec 11, 2024
Pages
3
Uploaded by ChefEel4472
Name Date Alka-Seltzer Strength LabPrelab Questions 1.What are the bubbles released when Alka Seltzer is dropped into water? (5 points) 2.What is the mole ratio between the moles of CO2produced and the moles of NaHCO3? (5 points) 3.Mass of the dry Alka Seltzer Tablet in grams. (5 points) 4.A student determines the mass of a 100 mL beaker filled with 50 mL of water to be 154.34 grams. The mass of the dry Alka-Seltzer tablet weighed 3.98 g. After the tablet reacts with the water, the mass, including the dissolved tablet, is 157.26 grams. Calculate the reaction’s mass loss. (10 points) 5.Using the mass loss calculated in question 4, what was the mass of NaHCO3that reacted? Remember that the mass loss is also the CO2mass. (5 points) 6.Using the data from problems 4 and 5, calculate the percentage of the tablet that reacted. (5 points)
Data Collection 7.As you go through the lab, record your data in the table below. (20 points) Trial 1 2 3 4 5 6 7 8 Mass of tablet (g) Amount of water (mL) Amount of vinegar (mL) Beaker and solution mass (g) Initial Mass: Beaker, solution, and tablet mass before reaction (g) Final Mass: Beaker, solution, and tablet mass after the reaction is complete (g) 8.Using information from the pre-lab and your data collection, complete the table below. You must show one calculation for each row, or no credit will be awarded for this section. (15 points) Calculations: Trial 1 2 3 4 5 6 7 8 Calculated mass of CO2(g) Calculated mass of reacted NaHCO3(g) Calculated % by mass of reacted NaHCO3in tablet
9.Sample calculation for mass of CO2lost: Ex. Show work for row 1, trial 1. (10 points) 10.Sample calculation for mass of NaHCO3reacted Ex. Show work for row 2, trial 1. (10 points) 11.Sample calculation for % by mass of reacted NaHCO3in tablet: Ex. Show work for row 3, trial1. (10 points) Post-Lab Question: 12.Looking at your data, which trial did it seem that vinegar was the excess reactant and NaHCO3was the limiting reactant? Hint: Where did you expect MORE CO2,but you got less than expected?