Acids &
Bases
By Robert McGee
Our Goals
for today
- To determine the difference
between Acids & Bases
- Discuss the importance of
studying Acids & Bases
- Perform an experiment dealing
with Acids & Bases
What is the
pH scale?
- The pH scale measures how
acidic or basic
a solution is.
The pH scale
- The pH scale is the concentration
of hydrogen ions in a given substance.
Identifying
Acids and Bases
- Acids have a
ph from 0-7
- Lower pH value indicates a
stronger acid.
- Bases have a
pH from 7-14
- Higher pH value indicates
a stronger base.
Definitions
of Acids and Bases
- An acid is a substance that
breaks into ions in
an aqueous solution.
- A Base (alkaline) is a substance
that breaks into
ions in an aqueous solution.
- Note: aqueous solution is
any solution where
is the solvent.
Did we Miss
something??
- What happens when the pH of
a substance is 7?
- Ans: A pH level of 7 indicates
a Neutral Substance i.e: Water!
Test Your Knowledge
- What is the range of an ACID
on the pH scale?
Ans: 0-7
- What is the range of a BASE
and what is another name for a BASE?
Ans: 7-14, Alkaline
Characteristics
Of Acids
- A sour taste.
- It turns blue litmus paper
red
- It tastes sour. Try drinking
lemon juice (citric acid)
Characteristics
of Bases
- A bitter taste. (Milk of Magnesia)
- It feels slippery. (Soapy
Water)
- It turns Red Litmus Blue.
Why Learn about
Acids & Bases?
- What do you think is the pH
level of NYC tap water?
- The pH of a swimming pool
must be checked periodically. Why?
- Is it important for Lakes
& Rivers to maintain a certain pH?
Today’s
Experiment
- Test the pH of Pepsi, tap
water, and drain cleaner