This document provides information about acids and bases for 7th grade students. It defines acids and bases, describes their physical and chemical properties, and explains how to measure acidity and alkalinity using the pH scale. Examples of common acids and bases are given. The document also discusses neutralization reactions between acids and bases and provides sample problems for students to practice determining whether solutions are acidic or basic based on their pH values.

1. 7TH
GRADE
7TH GRADE
Prepared By: Mira E. Bagay
ACID
AND
BASE

2. WHAT DOES IT TASTE LIKE?

3. WHAT DOES IT TASTE LIKE?

4. WHAT DOES IT TASTE LIKE?

5. WHAT DOES IT TASTE LIKE?

6. WHAT DOES IT TASTE LIKE?

8. 7TH
GRADE
7TH GRADE
Prepared By: Mira E. Bagay
ACID
AND
BASE

9. At the end of discussion, students should
be able to;
• Define acid and base
• Describe the physical and chemical properties of acids
and bases
• Use Ph scale to measure the acid / base level of the
material
• Explain the uses of acid and bases in our everyday life

10. ACID
• Are substances that tast sour.
• Latin word “acidus” (means sour)
• Not all acid taste sour, the
sourness can vary in different acid.
Properties of
Ex. Grapes, Coffee, Vinegar,
Oranges and etc.

11. • Turns litmus paper red/pink.
• Contains Hydrogen ions (H+)
that they release when dissolved in
water.

12. BASE
• Are substances that tast bitter.
• Also known as alkaline.
Properties of
Ex. Ditergent, shampoo, baking
soda and etc.
• When added to water give foam
and feel slippery to the touch.

13. • Turns litmus paper Blue.
• Contains Hydroxide ions (OH-)
that they release when dissolved in
water.

15. What will happen if we combined an acid
and a base?

16. • There will be a reaction happen called
"neutralization reaction.”
• Resulting in the formation of water and salt.

19. • The pH scale was invented
in 1909 by Danish
biochemist Søren Sørensen.
Pouvior Hydrogen (pH)
• The pH comes from the
french word means “The
power of hydrogen.”

20. • Based on the Figure, what does the range
from 0 – 14 indicate?
• What does pH that is less than 7 indicate?
• What does pH that is greater than 7
indicate?

21. 1. Which one between gastric juice that has
3.5 pH and tomato with the pH of 4.6 is
more acidic?
2. Which one between an ammonia solution
with a pH of 11.5 and a solution of baking
soda with a pH of 8.3 is more basic? Why?"

23. 1. Which one between a solution of bleach with a pH of
12.5 and a solution of milk of magnesia with a pH of
10.5 is more basic?
2. Comparing a solution of lemon juice with a pH of 2.3
and a solution of vinegar with a pH of 2.8, which one is
more acidic?

24. 3. Comparing a solution of household ammonia with a
pH of 11.0 and a solution of sea water with a pH of 8.0,
which one is more basic?
4. Between a solution of hydrochloric acid with a pH of
1.0 and a solution of orange juice with a pH of 3.5,
which one is more acidic? Why?

25. 5. Considering a solution of sulfuric acid with a pH of
0.5 and a solution of black coffee with a pH of 5.0,
which one is more acidic? Why?

26. Direction: Answer the following on in a 1/2 sheet
of paper.
1.Comparing a solution of stomach acid with a pH of 1.5
and a solution of apple juice with a pH of 3.0, which one
is more acidic?
2. Between a solution of vinegar with a pH of 2.8 and a
solution of tomato juice with a pH of 4.2, which one is
more acidic?

27. 3. Comparing a solution of antacid with a pH of 10.0 and
a solution of seawater with a pH of 8.1, which one is
more basic?
4. With a pH of 6.8, is the substance likely to be an acid
or a base?
5. If a solution has a pH of 8.5, would you classify it as
an acid or a base?.

28. ASSIGNMENT
Direction: Advance study about Acid and Base
indicator (p.98-102) and in a ¼ sheet of paper,
answer the folowing;
1. What is a pH Indicator
2. Prepare an example of indicators minimum
of 5

29. PROPERTIES OF ACIDS AND
BASES
BASES
● Aqueous solutions are also electrolytes
● Bases often have a bitter taste
● Bases also change the color of
indicators
● Bases do not react with metals in the
way that acids do
ACIDS
● Their aqueous solutions are electrolytes
● They conduct an electrical current
● Acids change the color of certain acid-
base indicators
● Acids react with active metals

30. TYPES OF SOLUTIONS
HYPERTONIC
Mercury is the closest
planet to the Sun and the
smallest of them all
HYPOTONIC
Venus has a beautiful
name and is the second
planet from the Sun
ISOTONIC
Despite being red, Mars is
actually a cold place. It’s
full of iron oxide dust

31. ACID PROPERTIES
TASTES
SOUR
Venus is the second
planet from the Sun
CONDUCT
ELECTRICIT
Y
Jupiter is the biggest
planet of them all
HIGHLY
CORROSIVE
Despite being red,
Mars is a cold place
REACT
WITH
METAL
Saturn is a gas giant
and has several rings

32. OTHER TYPES OF SOLUTIONS
ALLOY
Mercury is the closest
planet to the Sun
COLLOID
Venus is the second
planet from the Sun
EMULSION
Mars is actually a very
cold place
SOLUTE
Jupiter is the biggest
planet of them all
SOLVENT
Saturn is the only planet
with rings
SUSPENSIO
N
Neptune is the farthest
planet from the Sun

33. “This is a quote, words full of wisdom
that someone important said and can
make the reader get inspired.”
—SOMEONE
FAMOUS

34. ABOUT
MIXTURES
02
You can enter a subtitle here if you need it

35. A PICTURE
ALWAYS
REINFORCES
THE CONCEPT
Images reveal large amounts of data, so
remember: use an image instead of a long
text. Your audience will appreciate it

36. WHAT ABOUT
SOLUBILITY?
Solubility does not indicate how quickly a substance will dissolve; rather, it
indicates how much of a substance will dissolve at a particular temperature.
Some solutes dissolve quickly, whereas others take much longer. When a
solution is agitated or shaken, or when the temperature of the solution is
raised, a solute dissolves more quickly

37. HOW MUCH WILL DISSOLVE?
LIQUID-SOLID
SOLUTIONS
When the temperature of water rises, some
solutes, such as sodium chloride and calcium
carbonate, do not become more soluble
LIQUID-GAS SOLUTIONS
In contrast to liquid-solid solutions, the
solubility of a gas in a liquid-gas solution
diminishes as temperature rises

38. 0 to 14
is the pH scale range

39. 7
A solution with this value of pH is neutral
0
A solution with this value of pH is very acidic
7
Pure water has this pH value too

40. ACTIVITIE
S
03 You can enter a subtitle here if you need it

41. ACTIVITY 1
This aids in lowering the amount of acids in foods:
CHOOSE THE RIGHT ONE
Bases
pH Hydrogen
Ions
1
2
3
4
?
?
?
START AGAIN

42. ACTIVITY 1
This aids in lowering the amount of acids in foods:
CHOOSE THE RIGHT ONE
Bases
pH Hydrogen
Ions
1
2
3
4
GREAT!
?
?
?

43. ACTIVITY 2
SOLUTE SOLVENT
FORMATIO
N
SOLUTION
Gas Liquid Whipped cream ?
Liquid Liquid Mayonnaise ?
Liquid Solid Gelatin ?
Solid Solid Cranberry glass ?
Solid Gas Smoke ?
SEE THE
ANSWERS

44. TABLET
APP
You can replace the image on the screen
with your own work. Just right-click on it and
select “Replace image”