Name: __________________________________________ Date: _______________
Learning Target: You will precipitate calcium carbonate by mixing together solutions of
sodium carbonate and calcium chloride and determine the limiting reactant of the reaction.
Bell-ringer: Use the attached information (next page) to answer the following questions:
1. To the right is a chemical hazard label. What do the
colors mean on a chemical hazard label?
a. Red: _______________________
White
b. Yellow: _________________________
c. White: ___________________________
Blue
Yellow
d. Blue: ______________________________
Red
2. What do the numbers mean on a chemical hazard
label?
a. The number ______ is the most serious and the
number _______ is the least serious
b. What does the number four on a red background tell you about the chemical?
Stoichiometry and Limiting Reactant Lab
Purpose: to show how practical stoichiometry is by carrying out a reaction in lab and
determining the limiting reactant of a double replacement reaction.
Goal: to precipitate calcium carbonate when solutions of sodium carbonate and calcium chloride
are mixed.
Materials: Ring stand, ring, funnel, filter paper, 3 plastic cups, 3 plastic spoons, distilled water,
50 mL graduated cylinder, allotted amount of calcium chloride, and allotted amount of sodium
carbonate
Safety: The more dangerous chemical that we are working with is calcium chloride. Since
calcium chloride is a desiccant, meaning that it draws water to itself and dries out things around
it. Therefore, if it gets on your skin it can cause some irritation and damage to the skin. We will
wear gloves during this experiment. As always, we will wear goggles.
Name: __________________________________________ Date: _______________
Lab Write-up: Total of 30 points.
R
E
R
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Restate the purpose of the lab in your own words. (2 points)
The purpose of this lab was to…
Experiment is summarized. You don’t have to tell about every step, just give the reader
an idea of what you did (3 points)
In this lab we…
For this lab report include:
 The reaction that you carried out and a brief explanation of it
 A summary of the lab
Results are analyzed. Give a description of the data and results you collected. This is the
heart of your lab write-up. It needs to answer the purpose of this lab. Discuss the data
in a paragraph. You also need a data table in this section. Make sure to introduce your
data table with a sentence. (20 points)
My hypothesis was… The data shows… The data is summarized in the table
below…
For this report include:
 Your observations (2 points)
 Your data table (3 points)
 Show a sample calculation of how you found the
limiting reactant (5 points)
 Show a sample calculation of the theoretical yield
(predicted mass of calcium carbonate) (5 points)
 Show a sample calculation of the theoretical yield (5
points)
Note: You do NOT have to explain how to do the
calculations, just show me the math. (YAY!)
However, you do have to include a sentence before
each calculation briefly telling me what this is. The
following is the calculation that I performed in
order to find the limiting reactant… (and so on).
Uncertainties described. Look at the lab procedures and your notes. Discuss the sources
of errors and describe the effect that the errors had on the results (3 points)
One problem that I had… One thing that may have gone wrong was…
For this lab report include:
Any observations of losses (i.e. your solution was cloudy
after you filtered it)
New things are discussed. This should extend the experiment to other applications,
examples, or real-world situations. (2 points)
One way to use this information would be… One new thing I learned was…