Find the mass of the cup, water, and Alka-Seltzer tablet by adding the mass of the cup and water to the mass of the Alka-Seltzer tablet Find the mass of CO2 lost by subtracting the mass of the cup, water, and tablet after the reaction from the mass of the cup, water, and tablet before the reaction

Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Calculations

  1. Find the mass of the cup, water, and Alka-Seltzer tablet by adding the mass of the cup and water to the mass of the Alka-Seltzer tablet
  2. Find the mass of CO2 lost by subtracting the mass of the cup, water, and tablet after the reaction from the mass of the cup, water, and tablet before the reaction
  3. Use the molar mass to find the moles of CO2
  4. Use Avogadro’s Law to find the expected volume of CO2 produced at STP
  5. Use the ideal gas law to calculate the volume of CO2 produced at the real temperature and pressure you did the experiment at. Be sure to convert pressure to atm and temperature to K.
  6. Use the mass of CO2 and the following balanced equation to calculate the grams of sodium bicarbonate (NaHCO3) that are present in the tablet

H3C6H5O7 (aq) + 3 NaHCO3 (aq) à Na3C6H5O7 (aq) + 3 H2O (l) + 3 CO2 (g)

  1. Look at the active ingredients panel on the Alka-Seltzer box. Convert the mass of sodium bicarbonate given to grams and record in table 2.
  2. Calculate the percent error for sodium bicarbonate using the formula:

 

Data:

 

Table 1 Experiment Data

Item

Measurement

Mass of Alka-Seltzer tablet

 

Mass of cup and water

 

Mass of cup, water, and tablet after the reaction

 

 

Observations: (REQUIRED)

 

 

 

 

 

 

Table 2 Calculation Results

Item

Measurement

Mass of cup, water, and Alka-Seltzer tablet before reaction

 

Mass of CO2 lost

 

Moles of CO2

 

Liters of CO2 at STP

 

Liters of CO2 at your conditions

 

Mass of NaHCO3 in your tablet

 

Mass of NaHCO3 according to label

 

Percent error

 

 

 

Analysis:

 

  1. Based on the volume you calculated at your measured temperature and pressure, how many tablets would you need to fill a 9.6 L balloon with CO2?
  2. How close is the calculated mass of sodium bicarbonate to that reported on the ingredients label?
  3. What sources of error could have resulted in your percent error?
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