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What is acid?
What happens when acid falls on something: an object, an animal or food? If you do not know,
try to look at the exhaust pipe of old cars, and you will have a good hint:
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Acid occurs naturally in nature.
If you want to remember what acid is in food, remember that ACID = SOUR taste.
Of course, other acids that do not come from food are very dangerous!
Where can you find acid?
In drinks: ___________________________________________________________
In fruits: ____________________________________________________________
In candies: __________________________________________________________
Cite a few dangerous acids; usually they are products parents try to hide in the cabinets for the
safety of their children:
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What happens after a few days when you deep a piece of meet into coca-cola?
Describe:
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Along with acid, there is in nature what we call basic.
If you want to remember what basic is, remember that BASIC = BITTER taste.
What taste bitter in food?
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Activity:
ACID BASE SCALE.
Use a Ph paper or strips of boiled red garbage until they become white. Then, deep the
paper into diverse products you will find around the house. Read the color on the paper.
Acid scale Color chart:
…Pink….
…Orange…
…Green…
..Black..
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Dark pink: 1
Light pink: 2
Dark orange: 3
Mild orange: 4
Light orange: 5
Yellow-Orange: 6
Yellow-Green: 7
Seagreen : 8
Dark green: 9
Green- Blue: 10
Navy Blue: 11
Blue-Black: 12
____0___/1___/2___/3___/4___/5___/6___/7___/8___/9___/10___/11___/12___/13__
ACID (tastes sour)
NEUTRAL
BASE (tastes bitter)
Vinegar
(Water)
(Soap)
Try your own?
The more acid, the smaller the number:
Car battery
1.2
Vinegar
2.8
Orange Juice
4.0
Normal Rain
5.5
Neutral water
7
Seawater
8.5
Ammonia
11.5
Bleach
12.5
Lemon
Earth
Tap water
Coca-Cola
If you know that fish is affected at pH6 and stronger (smaller numbers);
trees & plants at pH 3.5 and stronger (smaller numbers);
buildings at pH 5 and stronger(smaller numbers), what can you conclude?
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