Solubility curves

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Solubility curves
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Solubility Curves

• solubility of a solute changes with temperature
• solubility of each compound is different at
  different temperatures
• solubility of each compound changes in a
  different way as temperature changes

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UNSATURATED, SATURATED AND SUPERSATURATED
SOLUTIONS

• UNSATURATED SOLUTION
• more solute can be dissolved while the
  temperature remains constant
• any point in the region under the solutes
  solubility curve
• 2. SATURATED SOLUTION
• no more solute can be dissolved into the solution
  at a fixed
• temperature
• any point ON the solubility curve
• 3. SUPERSATURATED SOLUTION
• solution containing more dissolved solute than
  normal at a
• particular temperature
• unstable
• may suddenly form solid crystals leaving only a
  saturated solution behind
• any point ABOVE the solubility curve

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Calculations using solubility curves

• Using The Graph On the Previous Slide
• 1. Is the solution saturated, unsaturated or
  supersaturated if there are 20g of KClO3 at 30C
• 2. Is the solution saturated, unsaturated or
  supersaturated if there are 5g of KClO3 at 50C
• 3. Is the solution saturated, unsaturated or
  supersaturated if there are 20g of KClO3 at 50C
• 4. 100 g H2O is saturated with KClO3 at 100C.
  How much KClO3 will come out of solution if the
  temperature is decreased to 48C?

Supersaturated
Unsaturated
Saturated
57 g-18 g 39 g