Density, Alcohol Content and the Archimedes Principle
Title: Density, Alcohol Content and the Archimedes Principle (Performed 09/11/13)
Report submitted by:
Purpose: Part I was to examine three different objects of the same material in order to identify the type of metal. We used the water displacement method and the buoyancy method according to Archimedes Principle. Part II was to find the density of ethanol by mass. We used a 25.0mL graduated cylinder and a 25.00mL volumetric flask to measure the volume. We used two different pieces of glassware to determine the most accurate density of ethanol by mass since the measurement of volume is variable.
Procedure: As stated in lab manual pages 23-24.
Data and results for part I: Density and identification of a solid:
Calculated Density Using the Water Displacement Method Mass of object (g) Initial volume (mL) Final volume (mL) Volume of object (mL) Density (g/mL)
Trial 1 17.635 61.9 64.0 2.1 8.4
Trial 2 21.707 71.9 76.0 4.1 5.3
Trial 3 16.755 67.8 69.8 2.0 8.4
d=m / V
Trial 1: d= 17.635g/2.1mL = 8.4g/mL
The average of the calculated density: 7.4g/mL
The calculated standard deviation: 1.8
We identified the metal as Zinc (7.14g/mL). However we believe the calculated density of trial 2 seemed inconsistent with the other two trials. Therefore we believe that the metal is actually yellow brass (8.47g/mL).
The percent error: - 13%
Calculated Density Using the Buoyancy Method Mass of object Initial mass in apparatus Final mass in apparatus Volume of object Density
Trial 1 17.65 15.47 2.18 2.18 8.10
Trial 2 21.72 19.17 2.55 2.56 8.48
Trial 3 16.77 14.76 2.01 2.01 8.34
dcyl = ms/Vcyl VH2O = Vcyl = m/dH2O
Trial 1: dcyl= 17.65g/2.18mL = 8.10g/mL
The average of the calculated density: 8.31g/mL
The calculated standard deviation: 0.099
We identified the metal as yellow brass (8.47g/mL)
The percent error: -2%
Data and
Report submitted by:
Purpose: Part I was to examine three different objects of the same material in order to identify the type of metal. We used the water displacement method and the buoyancy method according to Archimedes Principle. Part II was to find the density of ethanol by mass. We used a 25.0mL graduated cylinder and a 25.00mL volumetric flask to measure the volume. We used two different pieces of glassware to determine the most accurate density of ethanol by mass since the measurement of volume is variable.
Procedure: As stated in lab manual pages 23-24.
Data and results for part I: Density and identification of a solid:
Calculated Density Using the Water Displacement Method Mass of object (g) Initial volume (mL) Final volume (mL) Volume of object (mL) Density (g/mL)
Trial 1 17.635 61.9 64.0 2.1 8.4
Trial 2 21.707 71.9 76.0 4.1 5.3
Trial 3 16.755 67.8 69.8 2.0 8.4
d=m / V
Trial 1: d= 17.635g/2.1mL = 8.4g/mL
The average of the calculated density: 7.4g/mL
The calculated standard deviation: 1.8
We identified the metal as Zinc (7.14g/mL). However we believe the calculated density of trial 2 seemed inconsistent with the other two trials. Therefore we believe that the metal is actually yellow brass (8.47g/mL).
The percent error: - 13%
Calculated Density Using the Buoyancy Method Mass of object Initial mass in apparatus Final mass in apparatus Volume of object Density
Trial 1 17.65 15.47 2.18 2.18 8.10
Trial 2 21.72 19.17 2.55 2.56 8.48
Trial 3 16.77 14.76 2.01 2.01 8.34
dcyl = ms/Vcyl VH2O = Vcyl = m/dH2O
Trial 1: dcyl= 17.65g/2.18mL = 8.10g/mL
The average of the calculated density: 8.31g/mL
The calculated standard deviation: 0.099
We identified the metal as yellow brass (8.47g/mL)
The percent error: -2%
Data and