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Dilutions!. Mix 2 solutions together…. …they both get diluted. It’s ping pong balls in a bucket…. 5 gallon bucket - Ping pong ball. 5 gallon empty bucket - 5 Ping pong ball. Add 1 gallon of water. What’s the “concentration of ping pong balls”? 5 PPB/gallon!. Add another gallon of water.

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## Dilutions!

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**Mix 2 solutions together…**…they both get diluted. It’s ping pong balls in a bucket…**Add 1 gallon of water**What’s the “concentration of ping pong balls”? 5 PPB/gallon!**Add another gallon of water**What’s the “concentration of ping pong balls”? The ping pong balls are no different than atoms or molecules. If you have 5 moles in a bucket, you have 5 moles in a bucket!**5 gallon empty bucket**Add 5 ping pong balls and 2 baseballs.**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**Add another gallon of water**What’s the “concentration of ping pong balls”? The concentration of base balls is:**If they are different molecules…**The concentration gets calculated separately!**Add 1 gallon of water**2 BB in 1 gallon of water! 2 BB/gal**Add 2 gallon of water**5 PPB in 2 gallons of water 2.5 PPB/gal**Suppose I mix the two bukets**2 gallons + 1 gallon = 3 total gallons. The number of objects is unchanged.**And what if the objects are the same?**They just add together!**Add 2 gallon of water**5 PPB in 2 gallons of water 2.5 PPB/gal**Add 2 gallon of water**3 PPB in 2 gallons of water 1.5 PPB/gal**Suppose I mix the two bukets**2 gallons + 1 gallon = 3 total gallons of “solvent”. The number of ping pong balls also adds: 5 PPB + 3 PPB = 8 total PPB**Same with chemical solutions…**EXCEPT it’s usually Liters (or mL) of solvent… And it is MOLES! MOLES! MOLES! of solute**I mix 250 mL of 0.250 M NaCl with 500 mL of 0.100 M HCl.**What is the concentration of NaCl? 0.250 M x 0.250 L = 0.0625 molNaCl The problem doesn’t ask about HCl, but it is the same issue – dilution: 0.100 M x 0.500 L = 0.05 molHCl**I mix 250 mL of 0.250 M NaCl with 500 mL of 0.100 M NaCl.**What is the concentration of NaCl? 0.250 M x 0.250 L = 0.0625 molNaCl 0.100 M x 0.500 L = 0.05 molNaCl

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