e ls o oei jtrn u e lsoo e i j t r nu e oa d sei vvli s
TRANSCRIPT
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Concentrations of solutions
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E
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EO
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D S
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B VF L
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S HL O
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P A
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O EI
SH
L O
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P RA
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RP O E
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A ERE M RUE TT
O
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C U
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R E
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C T
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W O
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A ME
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T A D
T
A
ME
S R T EU
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ETNC A
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N E T RCO
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Solutions
saturatedunsaturat
ed
with maximu
m amount of solute
less solute
than the maximu
m amount
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Solutions
concentrated diluted
with large
amount of
dissolved solute
with small
amount of
dissolved solute
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Add more soluteLessen the solvent
How is a concentrated solution prepared?
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Lessen the solute
Add more solvent
How is a diluted solution prepared?
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Fruit juices sold in grocery stores are usually concentrated solutions. How is a diluted solution prepared out of these?
Case Analysis
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percent by volume = amount of solute in a given volume of solution expressed as grams solute per 100 milliliter of solution (g/mL)
percent by mass = amount of solute in a given mass of solvent expressed as grams solute per 100 grams of solution
How can the concentration of a solution be expressed quantitatively?
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70 mL of ethyl
alcohol in 100 mL water
Concentration of Common Materials
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What does this label mean?
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5 grams of acetic acid in
100 grams of vinegar
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Agua oxinada, a common antiseptic, is usually seen as 3% solution. What does that mean?
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karat – used to express the concentration of solid solutions, especially gold jewelries
pure gold = 24 karat
Concentration of Solid Solutions
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percent by mass = amount of solute in a given mass of solvent expressed as grams solute per 100 grams of solution
What is the concentration of an 18-karat gold?
percent by mass = mass solute in grams mass solution in grams
percent by mass = 18 karat 24 karat
x 100 = 75%
Therefore, an 18-karat gold is 75% gold!
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% by mass = (14/24)x100 = 58.3%
How much gold is found in a 14-karat gold?
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50 mL rubbing alcohol x 70 mL ethyl alcohol
How many mL of ethyl alcohol is present in a 50-mL bottle of 70% rubbing alcohol?
100 mL rubbing alcohol
35 mL ethyl alcohol
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200 mL (40/100) = 80 mL
How many mL of ethyl alcohol is present in a 200-mL bottle of 40% rubbing alcohol?
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5.4 grams x (75/100) = 4.05 grams copper
A one-peso coin has a mass of 5.4 grams. How many grams of copper are in a one-peso coin containing 75% copper by mass?
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How will you prepare a 0.2 g/mL sugar solution?
20 grams sugar
100 mL water
+
20 grams / 100 mL = 0.2 g/mL
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A group of students were able to gather the following data and observations after dissolving sugar in 100 mL of water.
Step Amount of Solute added
Observations
1 2 grams After stirring, sugar dissolves completely.
2 2 grams After stirring, sugar dissolves completely.
3 2 grams After stirring, sugar dissolves completely.
4 2 grams After stirring, sugar dissolves completely.
5 2 grams After stirring, some sugar is seen at the bottom of the container
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Move exam quiz covering Activities 1, 2 and 3.
Prepare a ½ sheet of paper cut lengthwise. No need to bring a calculator during the test. Calculators will be available at the stations.
Good luck!
Next session…