Steven Graham
9 September, 2016
Mrs. Roquebert
Chemistry
Lap Report #4-Experiment 3.1
I.
Purpose
The purpose of this experiment was to prove and confirm the law of mass
conservation.
II.
Equipment
We used rubber free gloves and we used a digital scale instead of an analog scale.
III.
Procedure
I’m not entirely sure if we put 2 cups of water in the pot to boil. That part of the
experiment was done before I could start recording data. Also, we did not let the
pot cool for several minutes after taking it off the stove, we only waited about one
hour.
IV.
Data and Observation
Item
Big Beaker
Small Beaker
The water and vinegar mixture, small
beaker, and watch glass
The mixture with lye, small beaker,
and watch glass
Mass
112 grams
48 grams
204 grams
199 grams
Item
Vinegar in the small beaker
The boiling water from the pot
poured into the big beaker
Water poured into the vinegar
Volume
About 60 mL
About 49 mL
10 mL
First we poured water into the pot and dropped the cabbage leaves into the
water. Then, we put the pot on the stove at high heat. We started a fiveminute timer when the water started boiling, then, we filled half of the small
beaker (about 60 mL) with vinegar.
After about 3 ½ minutes the water started to turn bluish purple. It was light
blue when we took the pot of the stove after five minutes. Next, we placed 1
tsp. of lye into the watch glass and poured the boiling water into the big
beaker (about 49 mL). We waited for the water to stop evaporating before
putting the stirring rod into the big beaker to hold up the watch glass. Then
we poured 10 mL of water into the vinegar and measured the mass of the
mixture, small beaker, stirring rod, and watch glass with lye in it at 204 g.
Then we scraped the lye into the beaker with the stirring rod then began
mixing it. The pink of the vinegar/water mixture changed to a yellow while
we stirred it. Also, we notice the mixture’s heat increased after we mixed the
lye into the vinegar/water mixture.
V.
After we mixed the lye, water, and vinegar, we measured the mixture, smalls
beaker, stirring rod, and watch glass at 199 g.
Conclusion
a. Bold Faced Term from Text
The Law of Mass Conservation-Matter cannot be created or
destroyed; it can only change forms. This law is used in every single
chemical experiment that has ever occurred.
b. Analysis
Our results do not match what they should have been. This experiment
was supposed to prove the first law of thermodynamics-the
conservation of mass. The mass was supposed to stay the same from
the beginning of the experiment, despite the chemical reaction that
took place.
c. Error Analysis
I think we may have not weighed the watch glass with the rest of the
materials at the end of the experiment, but I could not be sure. Other
than this possible mistake, I do not believe we made any other notable
errors.
d. Ideas for Future Studies
The Law of Conservation of Mass is used in every chemical reaction
that has ever taken place or ever will take place, so I guess I’m
interested in future studies, since I think chemical experiments are
super cool.
e. Improvements for Procedure
The procedures that the book gave us were very clear and concise.
VI.
Bibliography
Wile, Dr. Jay L., Exploring Creation with Chemistry, pp. 71 and 72