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Results and Discussion
The density of an unknown liquid was found using the difference method.
First,
the volume of the liquid was measured using the graduated cylinder.
Then its mass was
measured by finding the difference between the mass of the graduated cylinder with the
liquid and the mass of the empty graduated cylinder.
The density of the liquid was then
calculated using the formula
Density = Mass/Volume
.
The procedure was first tested on
water for accuracy which has a known density of 1.00grams/milliliter.
Three
experimental trials were performed for each substance.
Table 1: Mass, Volume, and Density Calculations for Water
Trial #
Mass of
liquid with
graduated
cylinder(g)
Mass of
empty
graduated
cylinder(g)
Mass of
Liquid(g)
Volume of
Liquid(ml)
Density of
Liquid(g/ml)
1
81.485
69.513
11.972
12.4
0.965
2
81.661
69.534
12.127
12.4
0.978
3
81.446
69.618
11.828
12.3
0.962
Sample Density Calculation: D = M/V = 11.972/12.4 = 0.965g/ml
Average Density (water) = (0.965+0.978+0.962)/3 = 0.968 grams/ milliliter
accepted value  mean value
Percent Error =
x 100
accepted value
1.00(g/ml) – 0.968(g/ml)
Percent Error =
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 Fall '05
 CHIRIK,P
 Chemistry

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