Lab Report on Density Measurement

2152 words 9 pages
INTRODUCTION

1.1 Background of the Experiment
Mass density describes how heavy an object is. Defined by the Greek letter ρ, read as rho, density is a basic yet important physical property of matter. For a bulk body without accounting its existing pores and voids, density is represented by the ratio of its mass and volume. It is given by the equation ρ= massvolume 1.
The SI unit of density is kg/m3. However, its CGS units, g/cm3 or g/ mL, are the most commonly used ones in the laboratory. The conversion is given by
1 gcm3=1gmL=1000 kgm3 [1].
The density of a homogeneous liquid is also defined by the amount of mass per unit volume. Liquid is usually confined in a container, so its volume is relative to the volume of its container [2].
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Compute for the volume of the alumina balls by subtracting the initial volume from the final volume of water in the graduated cylinder. B. Calculate for the density of the alumina balls by dividing the measured mass by the volume. C. Record and compare the resulting density of the alumina balls with the standard value at room temperature.

3.6 Data and Analysis
Table 1. The mass of the four 25-mL liquid samples measured in three trials Liquid | Volume (mL) | Mass (grams) | | | 1ST Trial | 2nd Trial | 3RD Trial | Water | 25.0 | 25.244 | 25.348 | 25.359 | Acetone | 25.0 | 20.131 | 20.147 | 20.163 | Ethyl Alcohol | 25.0 | 22.313 | 22.330 | 22.337 | Isopropyl Alcohol | 25.0 | 22.025 | 22.035 | 22.049 |

Table 2. The volume and mass of the two sets of alumina balls Alumina Ball (based on Size) | Set 1 | Set 2 | | Volume (mL) | Mass (grams) | Volume (mL) | Mass (grams) | Small cylindrical | 2.0 | 5.813 | 2.0 | 5.742 | Large cylindrical | 8.5 | 24.042 | 9.5 | 23.942 | Large spherical | 10.0 | 22.975 | 9.0 | 19.747 |

Table 3. Calculation of density of the four liquid samples Liquid | Density (grams/mL) | | 1st Trial | 2ND Trial | 3rd Trial | Water | 25.244 ÷ 25 = 1.00976 | 25.348 ÷ 25.0 = 1.01392 | 25.359 ÷ 25.0 = 1.01436 | Acetone | 20.131 ÷ 25.0= 0.80524 | 20.147 ÷ 25.0 = 0.80588 | 20.163 ÷ 25.0 = 0.80652 | Ethyl Alcohol | 22.313 ÷ 25.0= 0.89252 | 22.330 ÷ 25.0= 0.89320 | 22.337 ÷ 25.0= 0.89348 | Isopropyl Alcohol | 22.025 ÷ 25.0= 0.88100

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