Laboratory Measurements and Density

 Experiment #3

Laboratory Measurements and Density

January 23, 2012

Chemistry 1211L - 146 - Spring 2012

Procedure

1. Aluminum Cylinder

Step1: Weigh an aluminum cylinder to the nearest 0.1mg, using the analytical balance, and record the mass on the Summary Report Sheet.

Step 2: Determine the dimensions of the cylinder using vernier calipers and/or a ruler.

Step 3: Place the aluminum cylinder in a 25-mL graduated cylinder. Clean a buret and fill it with deionized water. Make sure the water meniscus is at, or below, the top calibration mark.

Step 4: Record the volume of the (aluminum plus water) in the graduated cylinder.

2. Ball Bearing

Step 1: Weigh each ball bearing on a top loading balance. The mass of each ball bearing should be determined to the nearest 0.01g and should be recorded in increasing order on the report sheet.

Step 2: Place the smallest ball bearing on the cover and measure the mass and record the value on the report.

Step 3: Tare the balance again and add the second ball bearing and record its mass. Continue until all the mass has been recorded.

Step 4: Measure the diameter of each ball bearing using the vernier caliper.

The procedure used for this determination is identical to that described in:

  Block/McKelvy/Denniston/Silverstein (2008). Laboratory Experiments for Chem 1211L & 1212L Cengage Learning p.18 & p.27 (Determination of Density)

Data

1. Aluminum Cylinder

{Cylinder (vernier)}

Trial # | Mass (± 0.0002 g) | Diameter (± 0.03 cm) | Height (± 0.03 cm) |

1 | 17.1408 | 1.27 | 4.96 |

2 | 17.1410 | 1.28 | 4.95 |

3 | 17.1409 | 1.27 | 4.98 |

Average | 17.1409 ± 0.0003 g | 1.27 ± 0.05 cm | 4.96 ± 0.05 cm |

{Cylinder (displacement)}

Mass of object (g)(± 0.0002 g) | Initial water volume (ml)(± 0.02 ml) | Final water volume (ml)(± 0.02 ml) |

17.1409 | 10.00 | 16.28 |

2. Ball Bearing

Ball # | Mass (± 0.0002 g) | Diameter (± 0.03 cm) |

1 | 8.3488 |...