topic: intro solutions and solubility do now: check out test grades
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Classification of Matter Pure Substances Mixtures Homogeneous Heterogeneous Elements Compounds VIDEOTRANSCRIPT
TOPIC: Intro Solutions and Solubility
Do Now: check out test grades
Classification of Matter
Matter
PureSubstances Mixtures
HomogeneousMixtures
HeterogeneousMixturesElements Compounds
VIDEO
Solution• Homogenous Mixture (aka SOLUTION):
particles too small to see– Particles evenly distributed– Particles do not settle– -translucent – looks clear
Parts of a Solution• Solute = dissolved substance• Solvent = dispersing medium (often water)
Solubility = the max amount of solute that can be dissolved in a solvent
• Many solids and gases dissolve in water
• As you increase the temperature, you can dissolve more solid
• Does this work the same with gas?• To get gases dissolve, decrease temperature
and increase pressure
Not everything dissolves in water
• Likes dissolve Likes• Water is polar, so only polar things will
dissolve in water• Things that dissolve in water
– Soluble ionic compounds– Acids (ex HCl)– Bases (ex. NaOH)– Polar covalent molecules
Dissolving an Ionic Substance in a WaterWe say it IONIZES (separates into ions)
• Example: • NaCl(s) Na+(aq) + Cl-(aq)• CaCl2(s) Ca2+(aq) + 2Cl-(aq)• AlCl3(s) Al3+(aq) + 3Cl-(aq)• The ions are spread out among
the water molecules.
Dissolving a Covalent Substance in waterstays as molecules
• Ex: sucrose• C12H22O11(s) C12H22O11(aq)• The sugar molecules are spread out
among the water molecules.
Water is often used as a solvent
• Soluble = dissolves in water = aq• Insoluble = doesn’t dissolve in water• Miscible = 2 liquids that dissolve• Immiscible = 2 liquids that don’t dissolve
Not everything dissolves in water
Summary: Factors Affecting Solubility
• Nature of the solvent and the solute:LIKE DISSOLVES LIKE
• Temperature
• Pressure (for systems with gases)