The Density And Volume Of A Water-Alcohol Mixture - Wikieducator

THE DENSITY AND VOLUME OF A WATER–ALCOHOL MIXTURE
INTRODUCTION
The purpose of this investigation is to discover
• the relationship between the density of a substance and the slope of a graph that shows the mass
of the substance versus its volume, and
• what happens to the volume of an alcohol–water mixture as the relative volumes of water and
alcohol are changed.
In addition, the investigation gives you practice in
• making accurate measurements of volumes and masses, and
• construction and use of graphs involving experimental results.
Note: You are required to hand in your written report on a separate sheet of paper. This lab hand–out
may be attached if you do not wish to re–copy the data tables. In this case, make sure your report
mentions where the data is.
DATA
Mass of empty “water” graduated cylinder = ___________
Mass of empty “alcohol” graduated cylinder = ___________
Table 1: Mass and Volume of Water, Alcohol and a Water–Alcohol Mixture
Mixture
Water
Alcohol
volume (mL)
mass (g)
TRIAL
volume (mL)
mass (g)
volume (mL)
mass (g)
1
0.0
------
25.0
25.0
2
5.0
20.0
3
10.0
15.0
4
15.0
10.0
5
20.0
5.0
6
25.0
0.0
------
25.0
column 1
column 2
column 3
column 4
EXPERIMENTAL PROCEDURE
Note: All masses MUST be recorded to 2 decimal places (0.01 g).
All volumes MUST be recorded to 1 decimal place (0.1 mL).
Whenever instructions refer to a “column” of data, you can find the column number at the bottom of
the appropriate table.
1. Using a grease pencil, label one 25 mL graduated cylinder “A” (for Alcohol) and a second cylinder
“W” (for Water). Wash and scrub the cylinders to clean them. Flick the cylinders several times to
“shake them dry” and dry the outside of the cylinders. Weigh the empty cylinders and record the data
in the DATA section.