1. Acids
and
Bases

2. Characteristics Of Acids
Acids can be characterized by:
A sour taste.
It turns blue litmus paper red
It tastes sour. Try drinking lemon juice (citric acid)

3. Characteristics of Bases
A Base is characterized by:
A bitter taste. (Milk of Magnesia)
It feels slippery. (Soapy Water)
It turns Red Litmus Blue.
4. It feels chalky

4. The ph scale measure how acidic or basic a solution is7 8 9 10 11 12 13 3 4 5 6 2 14 1 1 1 2 2 3 3 4 4 5 5 6 6 7 8 9 9 10 10 11 11 12 12 13 14
Strong Acid
Weak
Acid
Neutral
Weak
Alkali
Strong Alkali
The ph scale measure how acidic or basic a solution is

5. 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.

6. pH Scale 7 Acid Base 14 Acidic Neutral Basic [H+] pH 10-14 14 10-13 13
1 M NaOH
Ammonia
(household
cleaner)
Blood
Pure wate
Milk
Vinegar
Lemon juice
Stomach acid
1 M HCl
Acidic Neutral Basic
Acid
Base 7 14
pH Scale “

7. 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!