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Investigation I How Much Sodium Bicarbonate Is in the Mixture?
The purpose of this lab is to organize my trials of how much sodium bicarbonate and how
much sodium chloride is in one mixture. The goal for this lab is to be able to figure out two or
more ways to determine percent composition in sodium bicarbonate
. The next goal will be
carrying out trials to determine just how much
and NaCl is in a mixture.
By doing this experiment I hope to get the individual components of what is in a single mixture.
It is important to understand the components of a mixture because the purification of material
can lead to expenses in different chemical procedures. If we are able to figure out the
components of a mixture we can understand if it is impure. When the substance is impure it is
cheaper concluding that it is more important to understand the mixture is properly made.
Sodium chloride, pure
Sodium bicarbonate, pure
Unknown mixture of sodium chloride and sodium bicarbonate
1.0 M hydrochloric acid
250 mL beaker
150 mL beaker
50 mL Graduated Cylinders
Experiment A- Heating sodium bicarbonate and sodium chloride
Set up an apparatus consisting of the following pieces of equipment: ring stand, ring
clamp, triangle, Bunsen burner and hose.
Select 2 crucibles out of the lab drawer assigned to your group. Clean and dry each
crucible. Once the crucible has been dried always handle the crucible using the crucible
tongs for the remainder of the experiment. Always place the crucible on a clean and dry
evaporating dish and do not place the crucible directly on the lab bench. It could
otherwise pick up moisture or other contaminants off of the lab bench and give you
Use the crucible tongs to carefully place the crucible (uncovered) on the clay triangle on
the ring clamp.
Check your lab area for any paper or flammable objects. Tie your hair back and check to
make sure your goggles are on correctly.
Turn on the gas and light the Bunsen burner. Adjust the gas flow in the Bunsen burner to
create a flame consisting of an inner blue cone The tip of sharply defined inner blue
cone of the flame should almost touch and heat the crucible to redness.
Heat the crucible for 2-3 minutes at the maximum flame temperature.
Allow the crucible to cool and remove it from the clay triangle and place in on the
Weigh the cooled crucible using the weighing boat and making all weighings to the
highest precision possible with the balance available to you. Use the same balance to
make all weighings for a given sample. Record this value in the data table.
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