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Name & Title 10 pts
Stoichiometry Lab
BACKGROUND
The reaction of a carbonate with an acid is an example of a common chemical
reaction. One particular example is the reaction of acetic acid (vinegar) with
sodium hydrogen carbonate (baking soda). This reaction produces a salt, carbon
dioxide and water. A similar reaction is used by geologists to test rocks for the
presence of limestone (calcium carbonate) and could lead them to find oil. If
bubbles form, then the rock contains limestone.
Objectives (Copy WRyour notebooks): (10 points)
The objectives of this lab are:
v to experimentally determine the mass of NaCl that will be produced in
this reaction (actual yield),
v to calculate the theoretical yield of NaCl from the mass of baking soda
you started with
v to determine the % yield for the salt produced in the lab.
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both
Weigh an empty crucible and add 0.10 grams of NaHCO3 (Eaking Voda) into it. Record
on data table
Add HCl dropwise, until no more bubbles are produced.
3ODFHFUXFLEOHRQKRWSODWHDQGVHWKRWSODWHWR0HGLXPKHDW Keep the crucible on a hotplate XQWLOall the moisture evaporateV.
When dry, turn off the hotplate and UHPRYHWKH crucibles ZLWKWRQJVRUKRWKDQGV
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Weigh the crucible to find the mass of NaCl (Valt) formed. Record on Data table
DATA TABLE (Draw your own)
CALCULATIONS
Copy the balanced equation for this reaction is written below and fill in the
correct physical states. (10 points)
BBBNaHCO3(__)+ BBB HCl(__)
!BBB NaCl(__) + BBBCO2(__) +BBBH2O(__)
Calculate the theoretical yield of NaCl based on the amount of sodium hydrogen
carbonate that you started with. (Show Work) SRLQWV
Calculate the % yield using your actual yield of NaCl and the theoretical yield you
calculated above. (Show Work) (10 points)
Write down some probable reasons for the error and how it can be minimized? (10
points)
Write down one significance of measuring quantities accurately in our daily lives.
(10 points)
Clean Up: (10 points)