Alka Seltzer Tablet

1. Question:

 What is the actual mass of sodium hydrogen carbonate in an Alka Seltzer Tablet?

1. Materials:

• Chamical safety goggles
• One 250mL of Erlenmeyer flask
• 50mL graduated cylinder
• Dropper
• Balance
• 7 Alka Seltzer tablet
• Vinegar
• Distilled Water

1. Procedure:

1. First before anything, wear the safety goggles.
2. Prepare all the materials that will be used in the lap.
3. Fill water in a beaker, fill Vinegar in a beaker.
4. Measure the Erlenmeyer flask. Record the mass of it.
5. Grab the Erlenmeyer flask, and pour 30 mL of distilled water.
6. Then measure the water in the flask, then record the mass.
7. Unwrap the Alka seltzer from it package, weigh it, then record the mass. Drop it into the solution.
8.  After it stops fizzing, measure the solution, then record the mass.
9.  Subtract the weight of the solution and the weight of the reaction to find the mass lost, CO2.
10.  Pour the reaction down the drain, wash the flask and cylinder then dry it with paper towel.
11.  Pour 25 mL of water into a graduated cylinder than to the flas, and 5 mL of vinegar into a graduated cylinder than pour it back in to the flask.
12.  Measure the grams of the solution, then record the mass.
13.  Unwrap the alka seltzer, weigh it, then record the mass. Drop the alka seltzer in to the solution.
14.  After it stops fizzing, weigh the reaction, then record the mass.
15.  Subtract the weight of the solution and the weight of the reaction to find the mass lost, CO2.
16.  Pour the reaction down the drain, wash the flask and cylinder, and then dry it with paper towel.
17.  Pour 20 mL of water into a graduated cylinder, then pour it into a flask. Measure 10 mL of vinegar into a graduated cylinder, then pour it back into the flask.
18.  Weight the solution, then record the mass.
19.  Unwrap the alka seltzer, weigh it, and then record it’s mass. Drop the alka seltzer into the solution.
20.  After it stops fizzing, weigh the reaction, then record the mass.
21.  Subtract the weight of the solution and the weight of the reaction to find the mass lost, CO2.
22.  Pour the reaction down the drain, wash the flask and cylinder then dry it with paper towel.
23. Pour 15 mL of water into a graduated cylinder, then pour it into a flask. Measure 15 mL of vinegar into a graduated cylinder, then pour it back into the flask.
24.  Weight the solution, then record the mass.
25.  Unwrap the alka seltzer, weigh it, and then record it’s mass. Drop the alka seltzer into the solution.
26.  After it stops fizzing, weigh the reaction, then record the mass.
27.  Subtract the weight of the solution and the weight of the reaction to find the mass lost, CO2.
28.  Pour the reaction down the drain, wash the flask and cylinder then dry it with paper towel.
29. Pour 10 mL of water into a graduated cylinder, then pour it into a flask. Measure 20 mL of vinegar into a graduated cylinder, then pour it back into the flask.
30.  Weight the solution, then record the mass.
31.  Unwrap the alka seltzer, weigh it, and then record it’s mass. Drop the alka seltzer into the solution.
32.  After it stops fizzing, weigh the reaction, then record the mass.
33.  Subtract the weight of the solution and the weight of the reaction to find the mass lost, CO2.
34.  Pour the reaction down the drain, wash the flask and cylinder then dry it with paper towel.
35. Pour 5 mL of water into a graduated cylinder, then pour it into a flask. Measure 25 mL of vinegar into a graduated cylinder, then pour it back into the flask.
36.  Weight the solution, then record the mass.
37.  Unwrap the alka seltzer, weigh it, and then record it’s mass. Drop the alka seltzer into the solution.
38.  After it stops fizzing, weigh the reaction, then record the mass.
39.  Subtract the weight of the solution and the weight of the reaction to find the mass lost, CO2.
40.  Pour the reaction down the drain, wash the flask and cylinder then dry it with paper towel.
41. Pour 0 mL of water into a graduated cylinder, then pour it into a flask. Measure 30 mL of vinegar into a graduated cylinder, then pour it back into the flask.
42.  Weight the solution, then record the mass.
43.  Unwrap the alka seltzer, weigh it, and then record it’s mass. Drop the alka seltzer into the solution.
44.  After it stops fizzing, weigh the reaction, then record the mass.
45. Subtract the weight of the solution and the weight of the reaction to find the mass lost, CO2.
46.  Pour the reaction down the drain, wash the flask and cylinder then dry it with paper towel.
47.  Clean the station worked on.

• AFTER STEP 11 EVERYTHING IS BEING DONE THE SAME WAY, EXCEPT THE mL FOR WATER AND VINEGAR ARE CHANGING.

1. Table of result:

1. Analyze and Evaluate:

1. Major variables that have been worked with in this lap is the water, vinegar, and sodium hydrogen carbonate. The measured variables are the water and the vinegar, they’re also the manipulated variables. The controlled variable is the Sodium hydrogen carbonate.  

1. (HAND WRITTEN AND ATTACHED)    

1. (COMPUTER GRAPHED AND ATTACHED)  

1. As volume of vinegar increases, the alka seltzer won’t be completely dissolved. Some of it will be left at the bottom. It will take more time to dissolve the alka seltzer. This is because the vinegar becomes excess after certain mL. The alka seltzer left at the bottom is the excess. This allows the solution to produce more grams of Carbon dioxide. Thus the graph leveling off as vinegar increases.

1. The minimum volume of vinegar that could be used for this investigation is 15mL. This is because this is the limiting reagent in this case. After this, the graph is almost nearly a straight line.

1. Actual mass of sodium hydrogen carbonate is

1. 0.80g of sodium hydrogen carbonate is needed to neutralize citric acid and ASA. This is because water neutralizes solutes. Also, the amount of carbon dioxide lost is the least in the first trial, which is only 30 mL of water and 0 mL of vinegar. It dissolves almost completely the whole alka seltzer. Water is base, and citric acid and ASA are acids, so it neutralizes it.

1. The mass that neutralizes the citric acid and ASA is 0.8g so to find the excess mass of sodium hydrogen carbonate that neutralizes the stomach, subtract that 1.58g – 0.8g= 0.78g. So the mass that remains in excess to neutralize stomach acid is 0.78g.

1. When carbon dioxide dissolves in water, it makes the water acidic. Then the calculation when vinegar and the alka seltzer are added wouldn’t be correct. Thus there would be less than the expected carbon dioxide. The effect is that, it wouldn’t be correct, and the mass of sodium hydrogen carbonate would be less than expected.

1. Yes, the way we did the lap arouses doubt about my result. Some errors could be, while unwrapping the alka seltzer tablet, we could scrap off some of the content, and using flasks that are still wet.

1. Improvement to the investigation would be having 7 flasks for the 7 trials and using flasks that are dry, and to make sure nothing have been scrapped of from the alka seltzer.