1. DILUTIONS!

2. Mix 2 solutions together… …they both get diluted. It’s ping pong balls in a bucket…

3. 5 gallon bucket - Ping pong ball

4. 5 gallon empty bucket - 5 Ping pong ball

5. Add 1 gallon of water What’s the “concentration of ping pong balls”? 5 PPB/gallon!

6. Add another gallon of water

7. 5 gallon bucket - Ping pong ball

8. 5 gallon empty bucket Add 5 ping pong balls and 2 baseballs.

9. Add 1 gallon of water What’s the “concentration of ping pong balls”? 5 PPB/gallon! What’s the concentration of baseballs? 5 BB/gallon

10. Add another gallon of water

11. If they are different molecules… The concentration gets calculated separately!

12. Suppose I have 2 Buckets!

13. Add 1 gallon of water 2 BB in 1 gallon of water! 2 BB/gal

14. Add 2 gallon of water 5 PPB in 2 gallons of water 2.5 PPB/gal

15. Suppose I mix the two bukets

16. And what if the objects are the same? They just add together!

17. Add 2 gallon of water 5 PPB in 2 gallons of water 2.5 PPB/gal

18. Add 2 gallon of water 3 PPB in 2 gallons of water 1.5 PPB/gal

19. Suppose I mix the two bukets

20. Same with chemical solutions… EXCEPT it’s usually Liters (or mL) of solvent… And it is MOLES! MOLES! MOLES! of solute

23. PING PONG BALLS IN A BUCKET!