Seperations Notbook (5)
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Chemistry
Date
Jan 9, 2024
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Calculations:
1.
Mass percentage of each component
Percent Error= Measured Value-Actual Value/Actual value x100
a.
Salt= 35.48%
b.
Sand=31.61
c.
Calcium Carbonate=29.03
2. Percent recovery of the mixture =96.13%
Percent Recovery=salt%+sand%+calcium carbonate%
Conclusion:
3. The percent mass for each of the components was supposed to be 33.33%.
Looking at the percent calculation for our components we were extremely close
to the actual percent for each component. I believe the salt calculation must be
higher than the 33.33% because it may have still had some weight from the
water that it was being boiled in. The sand was the closest to the actual value
most likely because it is the easiest to separate physically. The calcium
carbonate is the farthest away most likely because we could have lost some of
the calcium carbonate in the water that did not completely react with the K2CO3
and stayed dissolved in the water.
4. Percent errors for each component
a.
Salt=6.45% error. The salt percent error I believe is a result of extra water
that did not boil off still being on the salt. It is possible that the filter paper
let some CaCO3 through.
b.
Sand=5.16% error. The sand percent error is most likely due to a loss
through filtering, it is possible some of the sand stayed on the filter paper
and was missed.
c.
Calcium Carbonate=12.9% error. The CaCO3 percent error is most likely a
result of not all of it getting off of the filter paper and not all of it reacting
with the K2CO3 and still being soluble in water as CaCl2.
5. The overall percent recovery for the experiment is quite high resulting in a very
successful experiment with a 96.13% recovery. However it should be noted that
the percentage for Salt is over 33.33% which is technically not possible because
the maximum recovery for salt would be 33.33% recovery so accounting for that
it would bring the overall percent recovery down to 93.97% which would still be a
very successful experiment.
Data Table I: Separation of the Components of the
Mixture
Unknown code:5
Mass of empty ‘beaker 1’, g
113.6g
Mass of ‘beaker 1’ + unknown, g
116.7g
Mass of unknown, g
3.1g
Mass of ‘beaker 2’, g
113.52g
Mass of ‘beaker 2’ + salt, g
114.62g
Mass of salt, g
1.1g
Mass of small watchglass + small filter paper, g
18.9g
Small watchglass + small filter paper + calcium carbonate, g
19.8g
Mass of calcium carbonate, g
.90g
Mass of evaporating dish, g
51.24g
Mass of evaporating dish + sand, g
52.22g
Mass of sand, g
.98g
DATA TABLE II: Mass % of Components and % Recovery of Mixture
Actual mass % composition of unknown (obtained from instructor):
Salt:
1.1g
Sand:
.98g
Calcium carbonate: .90g
Experimental Results
Mass of unknown mixture, g
3.1g
Mass salt, g
1.1g
Mass sand, g
.98g
Mass calcium carbonate, g
.90g
Mass % salt
35.48
Mass % sand
31.61
Mass % calcium carbonate
29.03
% recovery of unknown mixture
96.13
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