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Dilutions of Solutions

# Dilutions of Solutions - Dilutions of Solutions Or Why...

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Dilutions of Solutions Or: Why laundry detergent works.

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Dilutions Given a 1 liter of a 1 M NaCl solution, what will happen if I add a second liter of water? Is there a change in the number of moles of solute? What changes?
How many moles? First step: How many moles were in the flask when we started? Remember: M = n / V

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New Molarity Since the number of moles (n) did not change between the original solution and the new solution, calculate the new molarity based on the new volume (2 liters)
Actually… Whenever we want to determine number of moles in a solution where we know the concentration and the volume… M = n / V M x V = n

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Practice #1 If I use 0.5 L of a 5 M solution of NaCl, how many moles of NaCl am I using?
Let’s Make a Dilution! I want to make 3 liters of a 2.5 M solution of NaCl from my infinite source of 5 M NaCl Solution A (original) = 5 M NaCl Solution B (desired) = 3 L of 2.5 M NaCl

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First Step in a Dilution First, figure out the number of moles you
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Dilutions of Solutions - Dilutions of Solutions Or Why...

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