Acids are substances that are sour, such as lemon juice and vinegar, and are known as acidic. Bases are the opposite of acids and can also be corrosive, while alkalis are bases that are soluble in water. The litmus test and pH scale are used to determine whether a substance is an acid or base and the strength of acids and bases.

3. Acids
 The word “acid” means “sour” in latin.
 Everyday examples: Lemon Juice (citric
acid), vinegar, Hydrochloric Acid and
Sulfuric Acid.
 If a substance is an acid it is know as
“acidic”

6. Bases
 Opposite of acids.
 Equally as corrosive and dangerous as
acids.
 If a substance is a base it is known as
basic.
 Bases that are soluble in
water are known as
“alkalis”

7. How would you know if a
substance is an acid or a base?
 The LITMUS test (Indicator Test)

8. How would you know how
strong an acidic or a base is?
 pH scale.
 What does pH stand for?
 What does pH mean?