SLIDE 1
1
The pH Scale
Is a substance an acid or a base?
Acid Properties
- Donate H+ ions
- Taste sour
- React with certain
metals to produce hydrogen gas
- React with bases to
form salt and water
- Most formulas start
with H
- pH < 7
What is a hydrogen ion??
What is an ion?
An ion is an atom that has lost or gained an electron giving it a positive (+) or negative (-) charge.
USES OF ACIDS
- Citric acid and ascorbic acid (Vitamin C)
are found in orange juice
- Carbonic acid and phosphoric acid give a
“bite” to soft drinks
- Acids in your stomach aid in digestion
- Sulfuric acid is the most widely used
industrial acid in the world. It is used in making metals, paper, paints, and fertilizers.
Small Intestine
- pH 8, slightly
basic
- most chemical
digestion completed here
k
BASES
- A base is any compound that increases
the number of hydroxide ions (OH-) when mixed with water
- i.e, they are H+ acceptors
- A base solution tastes bitter
- A base solution feels slippery
- A base reacts with acids to form salt
and water
- pH > 7
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