SEVENTH EDITION
sams
PART 2
When measuring masses and volumes in the procedure below refer to the appendices "Measuring
the mass of an object on a triple-beam balance", "Reading measurement devices with markings",
and "Reading liquid Levels if you are not familiar with these procedures already.
1. From your kit obtain a 50 mL graduated cylinder.
2. Measure the mass of the graduated cylinder. Record this mass in the data table as the Mass of
Graduated Cylinder.
3. Using a squirt bottle add about 6 (+ 1 mL) of distilled water to the 50 mL graduated cylinder.
4. Read the graduated cylinder to measure the volume of water. Record this volume in the data
table as the Experimental Volume of Water.
5. Measure the mass of the graduated cylinder and the added water. Record this mass in the data
table as the Mass of Graduated Cylinder and Water.
6. Calculate the mass of water added to the graduated cylinder by subtracting the Mass of
Graduated Cylinder, from the Mass of Graduated Cylinder and Water. Record this value in the
data table as the Mass of Water.
7. Discard the water from the graduated cylinder.
8. Repeat steps 3-7, eight more times, but instead of using about 6 mL use about 10, 15, 20, 25,
30, 35, 40, and 45 mL of water.
9. Calculate the volume for each value of the Mass of Water assuming a density of 1.00
gram/mL for water. Record the results on the data table as the Accepted Volume of Water.
10. Calculate the percentage error for each volume measured by reading the graduated cylinder
using the equation in the introduction to this experiment. In this calculation you will be
assuming that the balance is calibrated and is therefore accurate. Therefore, the Accepted
Volume of Water calculated in the last step can be taken as the accepted value in the formula
for the Percent Error, and the Experimental Volume of Water obtained from reading the
markings on the graduated cylinder will be taken as the experimental value.
11. Construct a graph of Percentage Error versus Experimental Volume of Water. When
constructing this graph plan to extrapolate the volume down to 0.0 ml and 0.0% error and up
to 5% error.