Determining Density

Materials:

PPE: goggles, aprons

Dry 50 ml graduated cylinder

Dry 100 ml graduated cylinder

Balance

RO/DI Water

Squirt bottle

Reference Chart of Water Density at various temperatures

Thermometer (°C)

200 g reference standard

Procedure:

Days 1&2 1) Followed procedure as outlined in the handout with the following changes: Before doing step 1, find the mass of a 200 g reference standard to make sure the balance is working.

Purpose:

The purpose of conducting this lab is to use the lab equipment to determine the volume and mass of water. It is also to find out the density of water using the experimental data and to calculate the % error by comparing it with the standard density of water at the same temperature. This data will then be used to figure out the accuracy and precision of this experimental procedure. Another purpose is to write a technical write up for a chemistry lab experiment.

Data Chart 1: Determining the density of water-100 ml graduated cylinder Trial 1 Trial 2 Trial 3

Mass of 100 ml grad cylinder + water

104.03 g

123.90 g

74.30 g

Mass of empty 100 ml grad cylinder

55.11 g

55.17 g

55.29 g

Mass of water

49.19 g

68.73 g

19.01 g

Temperature of water

24 °C

27 °C

26.6 °C

Volume of water used

50.0 ml

70.0 ml

20.0 ml

Calculated (experimental) density

.983 g/ml

.982 g/ml

.951 g/ml

Accepted value for the density of water (from chart)

.997296 g/ml

.996512 g/ml

.996783 g/ml

% error

1.4 %

1.5 %

4.6 % Data Chart 2: Determining the density of water-50 ml graduated cylinder Trial 1 Trial 2 Trial 3

Mass of empty 50 ml grad cylinder

32.08 g

32.26 g

32.24 g

Mass of 50 ml grad cylinder + water

56.75 g

76.32 g

41.77 g

Mass of water

24.67 g

44.06 g

9.53 g

Temperature of water

27 °C

27 °C

27 °C

Volume of water used

25.0 ml

45.0 ml

10.0ml

Calculated (experimental) density

.987 g/ml

.979 g/ml

.953 g/ml

Avg. experimental density

.973 g/ml

Accepted value for density of water