9/3-9/4

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