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Unit 3, Lesson 14: Dilutions
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Dilution If I add water to a solution, I make it more dilute. This is called dilution. When I do this, the amount of solute (in mol) does not change. Thus mol1 = mol2. Since moles = molarity x volume, M1V1 = M2V2. We can use this equation to find the new concentration after a dilution.
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Examples If mL of M NaCl is added to mL of water, what is the resulting [NaCl] in the solution? If mL of M NaCl is added to mL of M NaCl, what is the resulting [NaCl] in the solution? Reminder: for #2, find [NaCl] from each dilution, then add them together. 10 min
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Brain Break!
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Now You Try! What volume of 6.00 M HCl is used in making up 2.00 L of M HCl? A student mixes mL of water with 25.0 mL of a NaCl solution having an unknown concentration. If the diluted solution has [NaCl] = M, what is the molarity of the original NaCl solution? 20 min
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Practice, Practice, Practice!
Homework: Pg. 102 #78-94 even numbers. Extra practice: Pg. 103 # – these are good practice problems to prepare you for the unit test! 10 min
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