Stoichiometry Lab Experiment
Reaction:
Aqueous calcium chloride reacts with aqueous sodium carbonate
Procedure
Day 1:
Making a calcium chloride solution
1. Obtain the 100mL volumetric flask. (These are very expensive so be very careful with
them!)
2. Calculate the amount of calcium chloride needed to create 100.0 mL of .25M calcium
chloride solution in the volumetric flask. Record your calculations below in the data
section.
3. Measure out the amount of calcium chloride needed and record the actual value used in
the table below.
4. Add the calcium chloride to the volumetric flask carefully by folding the weigh boat into
a funnel. Once all of the calcium chloride is in the flask, rinse the weigh boat with a
squirt bottle containing DI water to ensure the full amount of calcium chloride in the
flask. Keep the weigh boat as funnel so the water falls directly into the flask while
rinsing.
5. Fill the flask with the squirt bottle so that the meniscus is at the 100 mL mark. Place your
thumb over the mouth of the flask to ensure no solution can leak out and mix the flask by
switching it up and down until fully dissolved
6. Pour this solution into a clean 250mL beaker and rinse the volumetric flask thoroughly.
Making a sodium carbonate solution
1. Obtain the 100mL volumetric flask. (These are very expensive so be very careful with
them!)
2. Calculate the amount of sodium carbonate needed to create 100.0 mL of 0.5M sodium
carbonate solution in the volumetric flask. Record your calculations below in the data
section.
3. Measure out the amount of sodium carbonate needed and record the actual value used in
the table below.
4. Add the sodium carbonate to the volumetric flask carefully by folding the weigh boat into
a funnel. Once all of the calcium chloride is in the flask, rinse the weigh boat with a
squirt bottle containing DI water to ensure the full amount of sodium carbonate in the
flask. Keep the weigh boat as funnel so the water falls directly into the flask while
rinsing.
5. Fill the flask with the squirt bottle so that the meniscus is at the 100 mL mark. Place your
thumb over the mouth of the flask to ensure no solution can leak out and mix the flask by
switching it up and down until fully dissolved
6. Pour this solution into a clean 250mL beaker and rinse the volumetric flask thoroughly.
Mixing the solutions and filtering
7. Measure the mass of a piece of filter paper to the nearest 0.01 g and record.
8. Set up a filtering apparatus. (Funnel, 250 mL flask and filter paper that you measured-you will need to wet the filter paper down with a squirt bottle so that it sticks into the
funnel).
9. Label a clean, dry weight board and determine the mass of it, record this mass in the
provided data table
10. Pour the content of the volumetric flask into the beaker containing the calcium chloride
carefully. Try to make sure that this does not splash!
11. Using a stir rod, mix the solutions together to ensure a full reaction has occurred. Rinse
the stir rod with a squirt bottle back into the beaker to make sure you obtain the full
amount of the products.
12. Slowly pour the mixture into the filtering apparatus. Do not fill the funnel above the filter
paper or you will lose some of your precipitant.
13. Rinse the beaker a few more times with small amounts of distilled water in a squirt bottle.
Pour the rinse water into the funnel each time. You do not want to use a lot of water as
this will slow down the filtering process
14. After all of the solution and rinses have drained through the funnel; slowly rinse the
precipitate on the filter paper in the funnel with distilled water to remove any soluble
impurities. Again, you do not want to use a lot of water.
15. Carefully remove the filter paper from the funnel, and place it in the measured weigh boat
from step 3.
16. Then place the weigh boat in the teacher designated spot to dry overnight.
Day 2
Measure and calculations
1. Measure and record the mass of the weigh boat with the filter paper, and precipitate to the
nearest 0.01 g.
2. Dispose of the precipitate in a designated waste container.
3. Complete all calculations at this time.
Stoichiometry Lab write up:
Name:___________________________________________
Date:_____________
Partners:______________________________________________________________________
Table 1: Lab Data
Mass of the dry filter paper
Mass of the labeled, dry weigh boat
Actual mass of the calcium chloride
Actual mass of the sodium carbonate
Mass of the weigh boat, filter paper, and precipitate
Mass of the precipitant
Calculations:
You must show all work with proper units and substances for credit!!!
1. Write a balanced chemical equation for this reaction:
2. Calculate the mass of calcium chloride needed to make 100.0 mL of .25M solution
3. Calculate the mass of sodium carbonate needed to make 100.0 mL of a 0.5 M solution
4. Calculate which reactant is the limiting reagent for this reaction.
5. Based off of your answer above, what is the theoretical yield of the calcium carbonate?
6. Calculate your percent yield for this reaction:
Conclusion:
1. Look at your percent yield. Discuss thoroughly reasons for this percent yield for your
experiment. (I.E. explain why you had more or less of the product than you were
supposed, explain what actions might have attributed to the gain or loss of the
product, explain what you could have done better, ect.)