# Experiment 2 Lab Techniques and Measurements

Topics: Density, Water, Volume Pages: 5 (1061 words) Published: September 28, 2012
Procedure: Using distilled water, premeasured containers and objects determine displacement of fluids and density of objects. Use ice and heat measure temperatures in Celsius, Fahrenheit and Kelvin.

Purpose: Weighing objects. Figuring out the density with an object by calculated volume and Archimedes’ Principle.

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Data Table 1: Length measurements.
ObjectLength (cm)Length (mm)Length (m)
CD or DVD12 cm 120mm 0.12 m
Key5 cm50mm0.01m
Spoon15cm150mm0.15m
Fork18cm180mm0.18m
Data Table 2: Temperature measurements.
WaterTemperature (°C)Temperature (°F)Temperature (K)
Hot from tap42c107.6f315 k
Boiling99 c210.0 f372 k
Boiling for 5 minutes100 c212 f373 k
Cold from tap18 c64.4 f291 k
Ice water – 1 minute10 c50 f283 k
Ice water – 5 minutes5 c41 f278 k
Data Table 3: Mass measurements
ObjectEstimated Mass (g)Actual Mass (g)Actual mass (kg)
Pen or pencil5g5.1 g.0051 kg
3 Pennies9g8.1 g.0081 kg
1 Quarter5g5.6 g.0056 kg
2 Quarters, 3 Dimes12g12.4 g.0124 kg
4 Dimes, 5 Pennies22.0 g22.0 g.0220 kg
3 Quarters, 1 Dime, 5 Pennies34 g32.4 g.0324 kg
Key12.0 g12.0 g.0120 kg
Key, 1 Quarter, 4 Pennies30 g28.3 g.0283 kg
Data Table 4: Liquid measurements.
Mass AMass BMass B - A

Liquid
Volume
(mL)
Cylinder
with liquid (g)

Liquid (g)Density

g/mL
%
Error
Water5ml21.926.74.84.8/5ml0.96%
Isopropyl alcohol5ml21.925.83.983.98/5ml0.98%
Data Table 5: Magnet – Measurement Method.

Object:Mass
(g)Length
(cm)Width
(cm)Height
(cm)Volume
(cm3)Density
(g/cm3)
Magnet4.42.20.50.50.6257.04
Data Table 6: Displacement method.

Object
Mass
(g)Initial volume of graduated cylinder (mL)Final volume of graduated cylinder (mL)Object Volume (mL) Density
(g/mL)
Magnet4.48ml9ml14.4
Metal bolt8.08ml10ml24.0
Data Table 7: Archimedes’ method.

Object
Mass
(g)Mass of Displaced Water (g)Volume of Displaced Water (mL) Density
(g/mL)
Metal Bolt8.0115.61.17.27
Magnet4.4115.214.4
Data Table 8: Initial Concentration

Chemical
Mass
(g)Molecular Weight (g)Moles in Volumetric FlaskTotal Volume (L) Molarity
(mol/L)
Sugar

(C12H22O11)828.020.2860.0299.86
Data Table 9: Dilution Series

Dilution
Volume
(mL)

Mass (g)
Density
(g/mL)Initial Concentration (M)Volume Transferred (mL)Final Concentration (M) 025 mL25.81.0320 mL9.86
125 mL26.01.049.862.5 mL24.65
225 mL28.41.136110.9254.5 mL110.925
325 mL26.51.06332.7753 mL332.775
425 mL29.61.186 mL1996.65

1.0329.86
1.0424.65
1.136110.925
1.106332.775
1.181996.65

Questions

A. Water boils at 100°C at sea level. If the water in this experiment did not boil at 100°C, what could be the reason?

Water will boil at lower temperature at sea level. If the water did not boil at 100c the reason would probably be that you are above sea level.

B. While heating two different samples of water at sea level, one boils at 102°C and one boils at 99.2°C. Calculate the percent error for each sample from the theoretical 100.0°C.

102c = a 2 % error rate
99.2c = .8% error rate

C. An unknown, rectangular substance measures 3.6 cm high, 4.21 cm long and 1.17 cm wide. If the mass is 21.3 g, what is this substance’s density (in grams per milliliter)? The rectangular substance is 17.73cm3 and since the mass is 21.3g the substance’s density would be 1.2 grams per milliter.

D. A...