Lab Report

Determination of Density of Aluminum

January 25, 2011

Tinisha Hallback (Chem 1211L,Tues. 7:00-9:15pm)

Partners: Henrietta Mofoke & Shante Blackburn

Objective: To determine the Density of aluminum by water displacement and geometric formulas.

Procedure: The relationship between the mass of an object and its volume is called density. The mass and volume of aluminum was determined. The density was calculated by dividing the mass of the piece aluminum by its volume.

Results/Discussion

Table 1 Density of aluminum based on dimensions

Trial 1

Mass of aluminum sample 17.266 g

Dimensions of aluminum sample (length) 5 cm (diameter) 1.2 cm

Volume of aluminum sample 5.655 cm3

Density of aluminum sample 3.028g/cm3

Trial 2

Mass of aluminum 17.110g

Dimensions of aluminum sample (length) 5 cm (diameter) 1.2 cm

Volume of aluminum sample 5.655 cm3

Density of aluminum sample 3.026 g/cm3

Table 2 Density of aluminum based displacement of water

Trial 1

Mass of aluminum sample 17.1240 g

Final volume of the water in the buret 15 ml

Initial volume of the water in the buret 8.5 ml

Volume of water dispensed from the buret 5.655 cm3

Volume of water level on graduated cylinder N/A

Volume of aluminum sample 6.5 ml

Density of aluminum sample 2.634 g/cm3

Trial 2

Mass of aluminum sample 17.1112g

Final volume of the water in the buret 18 ml

initial Volume of the water in the buret 11.5 ml

Volume of water dispensed from the buret 5.655 cm3

Volume of water level on graduated cylinder N/A

Volume of aluminum sample 6.5 ml

Density of aluminum sample 2.6324 g/cm3

Avg density: 2.6332 g/cm3

Percent error is 12%

Calculations

D = M/V 17.1240/5.6555 = 3.027

Avg density: 3.028 + 3.026 / 2 = 3.027

Volume: 3.14159 x (1.2/2)2 x 5= 18.84954

Percent Value: 2.7-3.027/2.7 x 100 = -12.1 (Therical Value 2.7)

2.7 – 2.633/2.7 x 100

Conclusion: The density of aluminum was determined to be 2.6332 g/cm3. The actual density is 2.634 g/cm3 which...