1. Converting units

2. Converting Units
x1000
x1000
kg g mg
÷1000
÷1000

3. Converting Units
x1000
x1000
kL L mL
÷1000
÷1000

4. Unit g/L % ppm mg/L Using g and ml Example 25g/L 25% 25ppm 25mg/L
25𝑔 𝐿
25𝑚𝑔 1000𝑚𝐿
25𝑔 1000𝑚𝐿
25𝑔 100𝑚𝐿
25𝑔 𝑚𝐿
0.025𝑔 1000𝑚𝐿

5. Practice Convert the following into percent concentration: 150g/L
25ppm
37g/400ml
14mg/L

6. Practice
Convert the following into g/L:
12%
28ppm
30g/500ml
24mg/L

7. Practice
Convert the following into ppm:
33%
129g/L
30g/750ml
0.6mg/L

8. Practice
Place the following concentrations in order from least to most concentrated:
a. 0.4%
b.10g/L
c. 35ppm
d. 150mg/L

9. Dilutions

10. Drink too sweet! What do you do?

11. Reducing the concentration of a solution by the addition of solvent
What is Dilution?
Reducing the concentration of a solution by the addition of solvent

12. What’s happening to: Solute? Solvent? Concentration?
1 g of solute in 1 L of water
C= 1g/L
3 L of water
What’s happening to:
Solute?
Solvent?
Concentration?
1 g of solute in 4 L of water
C= 0.25g/L

13. Dilution
When you are diluting a substance the amount of solute remains the same
The volume of solvent increases
Therefore the concentration decreases

14. Formula
C1V1 = C2V2
Remember: mass remains the same!

15. Practice Problem
Kamille had 50ml of 20g/L solution of Kool-Aid. She found it to be too sweet so she added another 50ml of water. What was the final concentration (g/L)?
V1 = 50ml
C1 = 20g/L
= 0.05L
V2 = 50ml + 50ml = 100ml
C2 = ?
= 0.1L
C1V1 = C2V2
(20g/L)(0.05L) = C2(0.1L)
C2 = 1𝑔/𝐿 0.1
= 10g/L

16. Practice
Workbook:
p.30-33
P.36-39