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Stephanie Warner
Chem 153
Shidong Chu
16 September 2005
Density of a Solid
Purpose: The purpose of this lab is to determine the density of an unknown solid. This lab
also introduces the use of analytical balances and typical statistical treatments of
experimental data.
Calculations:
Mass of solid m
s
= m
2
– m
1
= 40.3439g – 32.1403g
= 8.2036g
Mass of 25.0 mL of water m
4
– m
1
= 55.4916g – 32.1403g
= 23.3153g
Mass of water “above” solid m
3
– m
2
= 62.4722g – 40.3439g
= 22.1283g
Mass of water displaced m
d
= (m
4
– m
1
) – (m
3
– m
2
)
= (55.4916g – 32.1403g) – (62.4722g – 40.3439g)
= 23.3513g – 22.1283g
= 1.2230g
Volume of water displaced v
w
= m
d
/ ρ
ρ @ 20° C = 0.9982 g/mL
v
w
= 1.2230g/ 0.9982g/mL
= 1.225 mL
Density of Unknown
ρ
s
=
m
s
/ v
s
in g/mL
= 8.2036g/1.225 mL
= 6.697 g/mL
Q Test
5.639 g/mL, 10.406 g/mL, 6.697 g/mL, 61.655 g/mL, 6.1106 g/mL
(61.655 – 10.406) / (61.655 – 5.6396) = 0.91
This means that 61.655g/ml is an outlier
(10.406 – 6.697) / (10.406 – 5.639) = .79
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