1. Concentrations in Percent

2. What is percentage?
“per 100”

3. Percentage Grey squares = 20 Total squares = 100 Percentage = 20%
What percentage of the squares are grey?

4. Percent (m/V)
We can also measure concentration in % (m/V)

5. What is the % concentration?
m= 2g
V = 25ml
C= 𝑚 𝑉 = 2𝑔 25𝑚𝑙
2𝑔 25𝑚𝑙 = 𝑥𝑔 100𝑚𝑙
2𝑔 25𝑚𝑙 = 8𝑔 100𝑚𝑙
1 ml of water (solvent)
1 g of solute 8%

6. Which drink has the highest concentration of sugar?
Situation
Which drink has the highest concentration of sugar?

7. 11.83% Practice Problem C=? m= 42g V = 355ml
1. What is the % concentration of sugar in a 355ml can of Coca-Cola?
C=?
m= 42g
V = 355ml
C= 𝑚 𝑉 = 42𝑔 355𝑚𝑙
42𝑔 355𝑚𝑙 = 𝑥𝑔 100𝑚𝑙
11.83%

8. 5.92% Practice Problem C=? m= 35g V = 591ml 35𝑔 591𝑚𝑙 = 𝑥𝑔 100𝑚𝑙
2. What is the % concentration of sugar in a 591ml bottle of Gatorade?
C=?
m= 35g
V = 591ml
C= 𝑚 𝑉 = 35𝑔 591𝑚𝑙
35𝑔 591𝑚𝑙 = 𝑥𝑔 100𝑚𝑙
5.92%

9. Practice V= 𝑚 𝐶 V= 24𝑔 8𝑔/100𝑚𝑙 = 24𝑔 𝑥 100𝑚𝑙 8𝑔 V=300ml C= 8% m= 24g
3. What is the maximum volume that Will can make of an 8% solution of chocolate milk if he uses 24g of Nesquik powder?
V= 𝑚 𝐶
C= 8%
m= 24g
V = ?
V= 24𝑔 8𝑔/100𝑚𝑙
= 24𝑔 𝑥 100𝑚𝑙 8𝑔
V=300ml

10. Practice
Workbook:
p.34-35