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Good
Afternoon !!! 
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contextualized Science 8 demoteaching

Prayer…
Attendance Checking…

Content Standard:
The learners demonstrate
an understanding of some
important properties of
solutions.

Performance Standard:
The learners shall be able to
prepare different
concentrations of mixtures
according to uses and
availability of materials.

Learning Areas:
The learners should be able to express
concentrations of solutions quantitatively
by preparing different concentrations of
mixtures according to uses and availability
of materials.
(S7MT-Id-3)
Express concentrations of solutions
quantitatively in making latik.

Let’s REVIEW !!!
What are the two components
of solutions?
Solute and Solvent

Let’s REVIEW !!!
What component of solution is
present in small amount?
solute

Let’s REVIEW !!!
What component of solution is
present in greater amount?
solvent

Let’s make a solution.
1. Pour approximate 300mL
of water in a beaker.
2. Add 1 teaspoon of salt.
3. Stir.

What is the appearance
of the solution?

4. Add another teaspoon of salt
in the solution.
5. Stir.
6. Continue adding 1 teaspoon
of salt until the added salt
no longer dissolves.

How many teaspoon of
salt have you added
until the salt no longer
dissolves?

How many teaspoon of
salt dissolved
completely in 300 mL of
water?

“There is a maximum amount of
solute that can be dissolved in a given
solvent at a certain temperature.”

Solubility of Solution
1. Unsaturated solution -
contains less solute than a
maximum amount it can
dissolve at a given
temperature.

2. Saturated solution - A
solution that contains the
maximum amount of solute
dissolved by a given amount
of solvent.

3. Supersaturated solution -
when a solution contains
greater amount of solute,
to the extent that the
added solute is
no longer dissolved.

Coco jam or latik
One must know the amount of sugar to be
dissolved in a given amount of coconut milk at
a given temperature.

Coco jam or latik
How to make latik?
What are some common ingredients in making latik?
What foods are best when eaten with latik?

Concentration of solution can be expressed
quantitatively either percent by mass or percent by
volume.
Percent by Volume
volume of solute
% by volume = --------------------- X 100
volume of solution
Ex.
volume of solute = 1 mL
volume of solution = 4 mL
1mL
% by volume = ------------- x 100 = 25%
4 mL
Percent by Mass
mass of solute
% by mass = ---------------------- X 100
mass of solution
Ex.
Mass of solute = 1gram
Mass solution = 4 grams
1gram
% by mass = ------------- x 100 = 25%
4 grams

Examples:
1. Ms. Ligaya is making a latik. She uses
300mL of sugar and 500mL of coconut milk.
What is the total volume of her latik solution?
Ans. 800mL
Given:
Volume of solute = 300mL
Volume of solvent = 500mL
Volume of solution = 800mL

2. What is the percentage composition by
volume of the solution in number 1?
Given:
Volume of Solution = 800mL
Required: % by volume

Given:
Volume of solution = 800mL
Required: % by volume
Solution:
volume of solute
% by volume = -------------------------- X 100
volume of solution

Solution:
volume of solute
% by volume = -------------------------- X 100
volume of solution
substitute the value…
300mL
% by volume = ----------- X 100 = 37.5%
800mL

2. What is the percentage
composition by volume of the
solution in number 1?
Ans. 37.5%

What is the percentage by mass
of a salt solution prepared by
dissolving 4g of salt in 36g of
water?
mass of solute
% by mass = ---------------------- X 100
mass of solution

What is the percentage by mass of a salt
solution prepared by dissolving 4g of salt in
36g of water?

Why do we need to know
about concentrations of
solution?

https://r1---sn-bavcx-hoay.googlevideo.com/videoplayback?itag=22&expire=1554306451&rat
…
Describe how the man in the
video made his latik. In terms
of the process, how is it differ
with our usual way of making
latik?

…
Which latik is more appealing
to you, the one that is made
of fresh coconut milk or that
one on the video?

…
Which is easier to use, fresh
coconut milk or the used of
processed coconut milk?

Matching Type
Match column A with column B.
A B
1. Unsaturated a. Component of solution in lesser amount
2. Saturated b. Component of solution in greater
3. Supersaturated amount
4. Solute c. solute is completely dissolve
5. Solvent d. small amount of solute is observed
e. large amount of solute is no longer
dissolved

II. Problem Solving
1. What is the percentage composition of
solution in the following: 5g sucrose
(sugar) in 90g water?
2. 250mL of sugar is dissolved in 500mL
coconut milk. What is the volume of
the solution? What is its percentage
composition?

Assignment
In a chemistry class, Rina
prepared a solution by mixing
25 g of sugar in 80 g of water.
What are the concentrations
of the solute and solvent in
percent by mass?

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contextualized Science 8 demoteaching

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