Unit 5: Solutions Concentration.

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Presentation transcript:

Unit 5: Solutions Concentration

Solutions – Key Terms Solute: the substance dissolved in a solution. Solvent: the dissolving medium in a solution. Solution: a homogenous mixture of solute + solvent

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

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

Molarity Example: 0.0117 mol of sugar is dissolved in a 0.350 L teacup filled with hot water. What is the molarity of the sugar solution? Known: moles = 0.0117 mol volume = 0.350 L Unknown: Molarity Equation: Answer: 0.0334 M

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