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Jess8219 Jess8219
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4 years ago Edited: 4 years ago, Jess8219
I have some questions continuing this experiment, it's based on its chart. I had to sketch the chart based on the 7 trials, the mass of NaHCO3 (y-axis) vs the volume of vinegar (x-axis). Not sure if it's 100% correct, 5-6 trial I got a mass of 1.95g.
Questions:
1. use the concepts of limiting and excess reagents to explain why the graph levels off as the volume of the vinegar increases.   
2. What is the actual mass of sodium hydrogen carbonate in an Alka-Seltzer tablet?
3. What mass of sodium hydrogen carbonate is required to neutralize the citric acid and ASA in a tablet? 
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Educator
4 years ago
1. use the concepts of limiting and excess reagents to explain why the graph levels off as the volume of the vinegar increases.

Eventually whatever vinegar reacts with is consumed in the reaction, so there's nothing left for the reaction to move forward.

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2. What is the actual mass of sodium hydrogen carbonate in an Alka-Seltzer tablet?

I did some research and found that the packaging indicates that each Alka-Seltzer tablet contains 325 mg of aspirin (acetylsalicylic acid), 1000 mg of citric acid, and 1916 mg of sodium bicarbonate. Not sure whether you use this or take the average of their mass for each trial.

Quote
3. What mass of sodium hydrogen carbonate is required to neutralize the citric acid and ASA in a tablet?

I believe this relates to the plateau effect you noticed in the graph.
Source  https://www.nelson.com/onseniorscience/chemistry11u/uniflip5/
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