1. Unit 5: Solutions
Concentration

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

3. Concentration Units
Concentration: a measure of the amount of solute dissolved in a given quantity of solvent
A diluted solution contains a small amount of solute
A concentrated solution contains a large amount of solute

4. Molarity
Molarity (M): the number of moles of solute dissolved in 1 L of solution
Units: M ex: 4.0 M is “4 molar”

5. 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

6. 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