Friday is the last day to contact me about Exam #1

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Presentation transcript:

Friday is the last day to contact me about Exam #1 Chapter 13- Solutions Friday is the last day to contact me about Exam #1

Where we are in the big picture…

Chapter 13: Solutions Solutions Solvent Solute Dissolving depends on

What we’ll cover: Definitions Control of Solubility Things that affect solubility Concentration units Colligative properties

Definitions Solubility

Solubility Soluble Examples Sugar: 200 g in 100 mL water at 20 ºC Ethanol: infinitely soluble in water Gases: infinitely soluble in one another

Definitions Solubility Saturated Unsaturated Supersaturated Concentration

What controls solubility? Rule of thumb: “like dissolves like” Example: Oil and water don’t mix.

Which will be the least soluble in water? CH3OH CH3CH3 NH3

Please make your selection... Choice One Choice Two Choice Three

Which will be the least soluble in water? CH3OH CH3CH2CH2OH CH3CH2CH2CH2CH2OH

How does thermodynamics control things? Enthalpy (DH) Stronger bonds and IMF’s are favored Enthalpy is negative if the forces in the solution are stronger than when the solute and solvent are separate Entropy (DS) Freedom of movement is favored Depends on both the solute and the solvent