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Interpreting Solubility Curves
Unit 9: Solutions
What are solubility curves?• Changing the
temperature and pressure changes the amount of solute that can dissolve.
• Solubility measures the amount of solute dissolved in a solvent at a certain temperature
• Solubility curves show the solubility (grams per 100g of water) at different temperatures
What are solubility curves?
• Points ON the curve show saturated soln
• Points ABOVE the curve show supersaturated soln
• Points BELOW the curve show unsaturated soln
What is the solubility of solids?• For solids…• As temperature increases solubility increases
• As temperature decreases solubility decreases
• This is known as directly proportional – they both do the same thing!
What is the solubility of solids?• Which substances
are solids?– KNO3
– NH4Cl– NaCl– K2SO4
– KClO4
What is the solubility of gases?• For gases…• As temperature increases solubility decreases
• As temperature decreases solubility increases
• This is known as inversely proportional – they do DIFFERENT things!
What is the solubility of gases?• Which substance is
a gas?– Li2SO4
Practice• Can more sugar dissolve in tea when it
is hot or cold? Explain your reasoning.
• If it gets too hot on a summer day, why might many fish die resulting in fish kills?