Effects of Solutions
LAB #3
BOBBY MOUNSTAH
AMBER PARAMOUR
MARIAH JOHNSON
Purpose

To classify mixtures as solutions or colloids using
the Tyndall Effect
Materials

Sodium Hydrogen Carbonate

Cornstarch

Stirring Rod

Distilled Water or Tap Water

Flashlight

Masking Tape

3 jars with parallel sides

Teaspoon

Cup
Procedures

1. Using a cup, make a paste by using ½
teaspoon of cornstarch with 4 teaspoons of
water

2. Fill 1 jar with water. Add 1½ teaspoon sodium
hydrogen carbonate to a 2nd jar and fill with
water. Stir to mix. Add the cornstarch paste to
the 3rd jar and fill with water. Stir to mix

3. Turn off all the lights in the room. Shine the
flashlight at each of the jars and record your
observations
(Data/Results): Jars Observations
Liquid in Jars:
Observations:
1. Baking Soda(Sodium Hydrogen
Carbonate is used in this)
The baking sodas particles could be seen
moving around randomly
2. Water
There were no visible particles
3. Cornstarch
The jars contents inside were transparent
Conclusion/Analysis

What was learned from this lab experiment is
that sodium hydrogen carbonate is used in
baking soda which is what was used in the lab.
Some errors would be the wrong amount of
cornstarch used or baking soda. The only one
that was obvious to see is the baking soda since
it was transparent. The first jar that contained the
cornstarch was visible to see but not a lot of
particles. The second jar contained only water
which didn't show anything but water.
Conclusion/Analysis Questions

1. The 2nd jar allowed us to see the beam of light, since it was only
water

2. What made the light beam visible was the liquids particles and the jar
itself since it reflected the light

3. Yes,the light beam would be visible in the filtrate because that water
was clear and barely had any particles in it

4. What would be observed if the baking soda was replaced with
sucrose or sodium chloride would still be the same

5. If cornstarch was replaced with flour or diluted milk, there wouldn't be
any paste which would ruin the lab since the paste is needed

6. Because if you see any moving particles in a liquid then it is a colloid,
but if you can't see any particles it is a suspension
CA. Standard: 1d

Students will formulate explanations by using
logic and evidence