1. Unit 6: Solutions
Molarity

2. Solutions – Key Terms Solute: the substance dissolved in a solution
Solvent: the dissolving medium in a solution
Solution: a homogenous mixture of solute + solvent
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3. Kool-Aid
What are the solute(s) and solvent?

4. Chocolate Milk
What are the solute and solvent?

5. Concentration Units
Concentration: a measure of the amount of solute dissolved in a given quantity of solvent
A dilute solution contains a small amount of solute
A concentrated solution contains a large amount of solute
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6. Molarity
Molarity (M): the number of moles of solute dissolved in 1 L of solution
Units: M ex: 4.0 M is “4 molar”

7. Molarity Example:
mol of sugar is dissolved in a L teacup filled with hot water. What is the molarity of the sugar solution?
Known: moles = mol
volume = L
Unknown: Molarity
Equation:
Answer: M

8. Molarity Example:
Intraveneous (IV) saline solutions are often administered to patients in the hospital. One saline solution contains 0.90g NaCl in exactly 100. mL of solution. What is the molarity of the solution?
Known: Mass = 0.90 g NaCl
Volume = 100 mL solution
Unknown: Molarity
Equation:
Answer: 0.15 M

9. Molarity Exit Slip
What is the molarity of a solution in which 5.3 grams of CaCl2 is dissolved in water to make 2.1 L of solution?
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