Unit 3, Lesson 14: Dilutions

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Presentation transcript:

Unit 3, Lesson 14: Dilutions

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.

Examples If 200.0 mL of 0.500 M NaCl is added to 300.0 mL of water, what is the resulting [NaCl] in the solution? If 300.0 mL of 0.250 M NaCl is added to 500.0 mL of 0.100 M NaCl, what is the resulting [NaCl] in the solution? Reminder: for #2, find [NaCl] from each dilution, then add them together. 10 min

Brain Break!

Now You Try! What volume of 6.00 M HCl is used in making up 2.00 L of 0.125 M HCl? A student mixes 100.0 mL of water with 25.0 mL of a NaCl solution having an unknown concentration. If the diluted solution has [NaCl] = 0.0876 M, what is the molarity of the original NaCl solution? 20 min

Practice, Practice, Practice! Homework: Pg. 102 #78-94 even numbers. Extra practice: Pg. 103 #95-102 – these are good practice problems to prepare you for the unit test! 10 min