Posted: June 2nd, 2022

In this lab, you will dissolve Alka-Seltzer tablets in different water/vinegar solutions. Vinegar contains acetic acid, so each solution will contain a different quantity of acid that reacts with the sodium bicarbonate in the antacid.

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In this lab, you will dissolve Alka-Seltzer tablets in different water/vinegar solutions. Vinegar contains acetic acid, so each solution will contain a different quantity of acid that reacts with the sodium bicarbonate in the antacid. For each sample, you will measure the amount of mass lost by the solution and calculate the amount of NaHCO3 that has reacted. You will then graph the calculated mass of NaHCO3 in the tablet against the volume of vinegar in the water/vinegar solution to determine the amount of NaHCO3 in the Alka-Seltzer tablet.
Procedures
Take six 50 mL beakers from the Containers shelf and place them on the workbench. You may want to label each beaker by double-clicking on the container and renaming it.
Take a balance from the Instruments shelf and place it on the workbench.
Weigh each beaker and record its mass to reference later.
Note: In a classroom laboratory, the beakers will not all have the same mass. It is therefore important to weigh each beaker independently.
The Materials shelf contains a bottle of vinegar solution that is 5% acetic acid. This bottle is labeled “5% vinegar”. Take water and 5% vinegar from the Materials shelf and measure the amount of each liquid as specified in the following table into the corresponding beaker.
Liquids to Combine
Beaker Water (mL) 5% Vinegar (mL)
1 30 0
2 28 2
3 26 4
4 24 6
5 22 8
6 20 10
Weigh each beaker again after the addition of the 5% vinegar and water. Record the mass of each.
Note: This is not the full initial mass, but the Alka-Seltzer© reacts too quickly to measure it with the balance. To find the total initial mass, you will have to add the mass of Alka-Seltzer© added to this mass.
Take another 50 mL beaker from the Containers shelf. Place this beaker on the balance, and click the Zero button to tare the mass of the beaker.
Add 3 g Alka-Seltzer© from the Materials shelf to the beaker on the balance, recording the actual mass dispensed from the balance display. The approximate weight of one tablet is 3 g. Transfer this Alka-Seltzer© to Beaker 1. Wait until all of the bubbling stops. This indicates that the reaction has finished and all CO2 has been released. Repeat this process for Beakers 2–6.
Weigh Beakers 1–6 again and record the total mass of each. This is the final mass.
Clear the bench of all materials, containers, and instruments, then return to your course page to complete any assignments for this lab.

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