Student
Instructions
Purpose:
The purpose of this experiment is to help students appreciate
the relationship between mass, volume and concentration,
and between actual and estimated values.
Materials:
 1 five
gallon aquarium
 1 100
mL beaker
 1 1000
mL beaker
 3 packets
Cherry KoolAid sweetened
 2stirring
rods
 1 large
stirring rod
 1 calculator
 Student
Journal Activity Sheets
Setup:
 Fill container
A with 100 mL of
water, container B
with 1000 mL of water and container C
with 10 L of water.
 Put one
packet each of Cherry KoolAid in containers A,
B and
C
and mix thoroughly so that no KoolAid settles
to the bottom of the solution.
Part
1 Determining Concentrations:

Fill
out Part 1 of the student journal activity sheets,
which asks for the mass of the indicator, volume of
the solution and concentration of the indicator in containers
A, B
and C.
Also, rate the concentration of the solution qualitatively
by describing the color of the solution (i.e. bright
red, red, light red, pink, etc)
Part
2 Estimating Volume and Concentration

Fill
out Part 2 of the student journal activity sheets,
which asks you to rank the concentrations of the solutions
from the highest concentration (darkest color) to the
lowest concentration (lightest color).

Also,
estimate the concentration of the Unknown
solution by comparing the color of the Unknown
to the colors of A,
B
and C
and estimate the volume of water in the Unknown
container.
Part
3 Calculating the Actual Volume of the Unknown

When
you are finished with Parts 1 and 2, ask your teacher
for the number of packets of KoolAid that were added
to the Unknown
solution and the concentration of the Unknown
solution. Now, calculate the Actual Volume of the
Unknown using the formula:
Concentration = Mass / Volume
(remember to use the total mass of the
indicator added to the solution, not just the mass of
one packet.)

Introduction
 Objectives  PreTest
 Presentation  Activity
 PostTest
PEER Curriculum
 Water
Quality Modules 
Teacher's
Pages  Standards
