Chem Lab #2
Volume & Density
Pre Lab: Page 1
• I Purpose
– Measure the volume of a quantity of water in 3
different graduated cylinders.
– Determine the density of aluminum.
• II Materials
– 3 graduated cylinders: 10 mL, 50 mL, and 100 mL,
Bunsen burner, striker, Harvard trip balance, ruler,
aluminum bar.
Pre Lab Page 2 (draw 2 tables ONLY so that data can be entered
when you do the lab)
– VI Data – draw tables NEATLY with a ruler (in tray)
and label. These are the headings, you draw the
tables.
– Volume:
Volume 
10-mL
1st trial (mL)
2nd trial (mL)
3rd trial (mL
Volume, mL (include estimated value to show sig fi
50-mL
100-mL
LEAVE 3 spaces….
Density of Al:
Trial
Mass
Volume
Vo
Va
% Error
(g)
(cm3)
(g/cm3)
(g/cm3)
%
#1
2.6989
#2
2.6989
#3
2,6989
Procedures:
Volume:
Place approximately 10 mL of water in the smallest graduated cylinder.
Measure (estimating the last digit) and record in the data table.
Pour the same water into the 50 mL graduated cylinder. Get as much water off
the sides and into the bottom as possible. Measure and record in the data
beneath the last reading.
Repeat, using the same water being poured into the largest grad. Cylinder.
Repeat this entire process two more times for two more trials.
Density:
Measure and record the mass of the aluminum bar using the scales.
Measure the length, width, and height of the Al bar and record each
measurement.
Determine the volume using V = lwh
Determine your observed value (Vo) for the density using: D = m
V
Determine your percent error using Va given in the table.
Repeat for density two more times, if possible.
Page 3
Show each formula. Put in your values with
units. Solve and write answers with units.
– VIII Calculations – show, formula, math,
and answer with units.
V = lwh = 7.58cm(2.50cm)(1.21cm)
V = 22.92= 22.9cm3
Vo = D = m/v
% Error = /Vo-Va/ x 100% =
Va
Reminders
• A person – aprons (get, each fold your own,
but A puts away)
• B person – gets goggles and puts them away
for the group
• If any items (equipment, trash, etc.) are left
behind for me to clean up, each person in
your group loses 1 point on the lab grade.
Individual report must include & be
stapled together:
• P. 1: Prelab I, II.
• P. 2: VI (tables completed)
• P. 3: VIII Calculations (formulas, work, and
answers with units and answers entered in
tables).
• P. 4: X Conclusion (2 statements). See lab write
up handout to give you ideas of what to say.
Lab Report Expectations
• DO NOT WRITE on the back of any sheet
• Staple your own report papers together (make
sure your name is on top sheet and that you
have 4 sheets)
• Hand in your group’s reports in a stack (ABC
by last name) BEHIND one cover sheet
• Paper clip the stack
• ONLY 1 report from the group will be graded