Chem 12

1. MODULE
LEGENDS
B A N G B A N G

2. WILLIAM A. ERRO
CHEMISTRY
꧁ ༺ GENEROSITY ꧁
GRADE 12
Topic 1 Topic 2 Topic 3 Topic 4 Topic 5

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8. Activity 1
a. H3O+
b. HCl
c. OH-
d. H2SO4
e. LiOH
f. NaOH
Identify the given compound whether an acid
or base.

9. Activity 2
In the following reaction, identify if water is
playing the role of an acid, a base, or neither.

10. Guide question
1. What is an acid and base properties of
water?
2. What is the relationship between [H3O+ ]
and [OH- ] in pure water at 25°C?
3. How can the relationship between [H3O+ ]
and [OH- ] be used to define or identify if the
solution is basic or acidic?

11. Topic
acid - bases properties of
water
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12. WHAT IS AN ACID?
 An acid is a solution that has an excess of H+
ions.
 It comes from the Latin word acidus that means
"sharp" or "sour".
 The more H + ions, the more acidic the solution.

13. PROPERTIES OF AN ACID
 Tastes Sour
 Conduct Electricity
 Corrosive, which means
they break down certain
substances. Many acids can
corrode fabric, skin,and
paper
 Some acids react strongly
with metals
 Turns blue litmus paper red

14. USES OF ACIDS
 Acetic Acid = Vinegar
 Citric Acid = lemons,
limes, & oranges.
Ascorbic acid = Vitamin C
which your body needs to
function.
 Sulfuric acid is used in
the production of
fertilizers, steel, paints,
and plastics.

15. WHAT IS A BASE?
 A base is a solution that
has an excess of OH- ions.
 Another word for base is
alkali.
 Bases are substances
that can accept
hydrogen ions

16. PROPERTIES OF A BASE
 Feel Slippery
 Taste Bitter
 Corrosive
 Can conduct electricity. (Think alkaline
batteries.)
 Do not react with metals.
 Turns red litmus paper blue.

17. Uses of Bases
 Bases give soaps, ammonia, and
many other cleaning products
some of their useful properties.
 The OH- ions interact strongly
with certain substances, such as
dirt and grease.
 Chalk and oven cleaner are
examples of familiar products
that contain bases.
 Your blood is a basic solution.

18. WATER
is a unique solvent.
SPECIAL PROPERTIES
 is its ability to act either as an acid or as a base(amphoteric).
Ex.
 Water accepts and donate a proton (amphiprotic).
Ex.

19. IONIZATION OF WATER

20. Equilibrium Constant
Ion -Product Constant of Water

21. 1. The concentration of OH ions in a certain household ammonia cleaning solution is 0.0025 M. Calculate the
concentration of H ions.
= H ydrogen ion concentration
= ion- product ionization of water
= 0.0025 M.

22. 1. The concentration of OH ions in a certain household ammonia cleaning solution is 0.0025 M. Calculate the
concentration of H ions.
= H ydrogen ion concentration
= ion- product ionization of water
= 0.0025 M.

23. = H ydrogen ion concentration
= ion- product constant of water
=1.3 M.
Ex. 2. Calculate the concentration of OH ions in a HCl solution whose hydrogen ion concentration is 1.3 M.

24. 1.What do we mean when we say that water is
amphiprotic? (a) Can we also describe water as
amphoteric? Why?
2.Give at least two (2) things that we use in our daily
activities which is amphiprotic in nature and explain why.
3.If a base is added to pure water, why does the [H3O+ ]
decrease?
4.What is the importance of acid- base properties of
water in our daily life.
Guide questions

26. TOPIC 5
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