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First, set up the clean, dry burette with a funnel on the top of it. Make sure
that the burette is closed. Then, add the NaOH solution to the burette.
Immediately clean up any spills of NaOH. Place a waste beaker below the
burette and allow a small portion of the NaOH solution to run through the
burette tip. Then, close the burette again.
Then, using a clean, dry pipette, add 5.0 mL of the acid to a dilution flask. Fill
the flask to a bit below the line, cap, and shake. Remove the cap and
continue filling to the fill line.
Using a new clean, dry pipette, add 25.0 mL of the diluted acid solution into
a clean, dry Erlenmeyer flask. Add 2 or 3 drops of indicator to this flask. Then,
place the flask underneath the burette tip.
Write down the initial volume of NaOH in the burette. Carefully begin to add
small portions of the NaOH solution from the burette, swirling the Erlenmeyer
flask’s contents as you go. When the indicator begins to show a nonpermanent colour change, slow the addition of the NaOH and decrease
how much is added each time. Continue adding until the colour change is
permanent (when it lasts for 30 seconds or more). Record the ending volume
of NaOH in the burette once this equivilence point has been reached.
Repeat the titration process by adding 25.0 mL of the diluted acid to a new
clean and dry Erlenmeyer and repeating the above. Repeat until you have 3
sets of titration data.
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Create a 1/20th dilution of the acid. Fill
the burette with NaOH. Add 25 mL of the
diluted acid to an Erlenmeyer flask. Add
indicator. Titrate the diluted acid.
Repeat the titration twice more. Clean
up any spills of NaOH immediately.
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To …
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To determine the boiling point of a
substance and if boiling point is a
characteristic property
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If … then … because …
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If the class melting points are all the
same, then … because …
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Liquids “A” and/or “B”
2 Test tubes
Two hole rubber stopper
Thermometer
Glass bend
Short rubber tubing
Burner
Ring stand
Test tube clamps
Beaker
Boiling chips
Water
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1) Fill test tube 1/3 full of either liquid A or liquid B.
2) Add two boiling chips to the test tube.
3) Using glycerin to lubricate the thermometer and
glass bend place the thermometer and glass bend in
the two hole stopper.
4) Place the stopper with the glass bend and
thermometer in the test tube and place this test tube
over the burner.
5) Place the other (empty) test tube in the beaker
containing cool water.
6) Attach the rubber tubing to the glass bend and
place the free end of the rubber tubing in the empty
test tube in the water.
7) Heat the test tube with the liquid in it, recording
the temperature every 30 seconds until ¼ of the liquid
remains.
8) Clean up your station.
9) Graph the time and temperature data.
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What would it look like?
Time / minutes:seconds
Temperature / degrees Celsius
0:00
23
0:30
24
1:00
25
1:30
27
2:00
29
2:30
32
3:00
36
Etc.
Etc.
1) …?
 2) …?
 3) …?
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2 graphs – what are they?
1) What are responsible for the different
boiling points for substances A and B?
 2) Based on your answer for the above, why
would it make sense for boiling point to be
a characteristic property (ie: why shouldn’t
it depend on amount present)?
 3) Suppose you had an unknown liquid.
Propose at least two properties you could
test that would allow you to determine the
identity of the substance.
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Restate purpose
 Restate hypothesis
 3 reasons for why your hypothesis was
correct/incorrect
 Theme
 Scientist AND a brief summary of their
work related to this lab/the theme
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