# Chemistry

posted by .

Performing the same experiment described on your lab manual, a student used a 0.358 g sample of Alka-Seltzer and the mass of CO2 was found to be 0.102 g. Based on this result, answer the following questions:

Determine the mass of NaHCO3 that produced the CO2 in the experiment.
0.195

Determine the % mass of NaHCO3 in the sample.

Determine the mass of NaHCO3 in the tablet assuming the mass of the tablet is 3.50 g.
How do i do the second and third questions?

• Chemistry -

I answered this same question for someone earlier but I can't find it. I think I erred in that post because I don't know the reaction. What are the conditions under which the loss of CO2 occurred?
Is that a titration experiment or was the tablet heated? If heated, at what T?

• Chemistry -

OK. I found the other post and you're the one who posted it. Therefore, disregard that post until you answer the questions about how the tablet was treated.

• Chemistry -

reaction between NaHCO3 and HCl

• Chemistry -

I did the equation of the % mass but its wrong

• Chemistry -

I want to know how the tablet was treated. You make reference in the problem to "Performing the same experiment described on your lab manual, a student used a 0.358 g sample of Alka-Seltzer ......." So you know how the sample was treated but I don't. Was it titrated with something such as HCl? heat to drive off CO2. If so what temperature was used.

• Chemistry -

HCl is added to NaHC03 .

• Chemistry -

HCl + NaHCO3 => H2O + CO2 + NaCl

Convert the 0.102 g CO2 to g NaHCO3.
0.102g CO2 x (molar mass NaHCO3/molar mass CO2) = 0.102 x 84/44 = 0.195.
Is that 0.195 you posted what you obtained.
Then %NaHCO3 = (0.195/0.358)*100 = about 54.4%. Check that.
If your earlier reply meant you tried these numbers and the data base said it was wrong then I need the procedure written out for me. This answer is right for what you've posted.

• Chemistry -

Yes its correct, but how about he mass of NaHCO3 in the tablet assuming the mass of the tablet is 3.50 g

• Chemistry -

That must be for a part of the problem you didn't post.

If the tablet is 54.4% NaHCO3 and the tablet has a mass of 3.50 g, then plug these numbers into the % formula and calculate mass NaHCO3.
(mass NaHCO3/mass tab)*100 = %
(x/3.50)*100 = 54.4
Solve for x = mass NaHCO3.

## Similar Questions

1. ### CHEMISTRY

I have two: 1. why can you not find the mass of a beaker, water, vinegar and alka seltzer in one step rather than recording alka seltzer by itself?
2. ### chemistry

final mass initial mass CO2 mass (1.) 84.755 minus 85.672 = .917 (2) 84.733 minus 85.684 = .951 (3) 84.757 minus 85.707 = .95 what is maximum volume of vinigar that can be neutralized by one alka seltzer tablet and explain?
3. ### general inorganic biochemistry

you have set up the apparatus for this experiment and collected the following data: Atmospheric pressure- 721.o torr temperature-22.0c Gas constant- 0.0821 L atm/mol K you then ran the experiment using 0.3234 g of alka seltzer and …
4. ### Chemistry

a student used a 0.358 g sample of Alka-Seltzer and the mass of CO2 was found to be 0.102 g. Based on this result, answer the following questions: Determine the mass of NaHCO3 that produced the CO2 in the experiment. Determine the …
5. ### Chemistry Lab

The experimental data you entered is: Trial #1 Trial #2 Trial #3 Mass: gelatin capsule (g) .123 .118 .122 Mass: whole alka-seltzer tablet (g) 3.230 3.230 3.230 Mass: capsule + alka-seltzer sample (g) .822 .882 .677 Mass: system before …
6. ### Chem Lab Help

Trial #1 Trial #2 Trial #3 Mass: gelatin capsule (g) .123 .118 .122 Mass: whole alka-seltzer tablet (g) 3.230 3.230 3.230 Mass: capsule + alka-seltzer sample (g) .822 .882 .677 Mass: system before reaction (g) 23.109 23.110 22.735 …
7. ### chemistry

Does Alka-Seltzer dissolve faster in hot or cold water?
8. ### chemistry

does alka seltzer dissolve faster in hot water or cold water experimental errors that could take place?
9. ### chemistry

An alka-seltzer tablet weighing 3 grams is added to a flask of water (weighing 250 grams).At the end of the experiment, the flask weighs a total of 249.6 grams.Explain why this experiment does not seem to follow the Law of Conservation …
10. ### Chemistry

We did a titration lab, and one of the post-lab questions says: "the manufacturer of the vinegar used in this experiment claims that the vinegar contains 5% acetic acid by weight. Use your results and a density of 1g/mL to determine …

More Similar Questions