Acids & Bases: Common Household Products
Purpose: Learn about indicators. Learn how to use litmus paper and pH
paper test strips. Learn to match colors of pH paper to the color chart
provided and identify the pH of each substance. Compare pH range with acid
and base.
Safety
Safety glasses should be worn at all times.
Never taste chemicals – even if you know their identity
Ammonia liquid and vapor are extremely irritating, especially to eyes.
Wash your hands immediately if you come in contact with any of the
chemicals.
Materials & Equipment
Hydrion pH paper
HCl
Baking Soda
Red litmus paper
Lemon juice
Soft Drink
Blue litmus paper
Ammonia
Detergent
Stir sticks
Vinegar
Bleach
Procedures
1. Rotate through the lab stations in any order as long as you do all of
them.
2. At each station you will find a beaker of a liquid and a stir stick. One
station is distilled water, the other stations have a solution made from
diluting one of the products listed above with distilled water.
3. Each station should have one tube of blue litmus paper, one tube of
Cut the paper
red litmus paper, and one tube of Hydrion pH paper.
in half please!
4. Touch the stick to the red litmus, blue litmus, and pH paper strips.
Record the color in the first 3 columns of the data table. In the 5
th
column identify the substance as and acid, base or neutral. In the last
column match the color of the pH paper to the chart on the tube and
record that number in the data table. Distilled water has been done as
an example.
5. Clean up the station before moving on.