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Lecture 3

01:160:171 Lecture 3: Density of WaterExam


Department
Chemistry
Course Code
01:160:171
Professor
M.Vitarelli
Lecture
3

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Significant Figures and the Density of Water
September 18th, 2018
1 Lab Objective
In this first experiment, we calculate the density of water experimentally, using a beaker, buret, and an
analytical balance.
1.1 Definitions
Density Density is recorded as mass
volume .
2 Experiment
While using the analytical balance, measurements of mass should be recorded to the highest precision
available. In this laboratory, record the measurement of mass to the nearest milligram.
a. Record the mass of an empty 50 ml beaker. Record the value in Table I. The mass of the empty
beaker will be the same for all trials.
b. Record the initial burette reading in the table.
c. Add between 1.0 ml to 1.5 ml of water to the beaker. Weigh the beaker and record the mass as beaker
+ liquid. Do not discard the water: for each trial, the volume of water will always be increasing.
d. Record the nal burette reading in the table.
e. Subtract the nal and initial burette readings to obtain the volume of water added to the beaker.
Record this value in the table.
f. From the mass of the beaker + water, subtract the weight of just the beaker. This will reveal the
mass of the water in the beaker. Record this in table I.
g. Repeat this procedure four more times, adding water to the beaker each time.
h. Plot the mass of water vs. volume in water in ml on the rst graph, then t a straight line to it. The
slope of this like will be the density of water in g/ml.
1
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