Solubility curvesSolubility curves

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

UNSATURATED, SATURATED AND SUPERSATURATED SOLUTIONS

1. UNSATURATED SOLUTION• more solute can be dissolved while the temperature remains

constant• *any point in the region under the solute’s solubility curve2. SATURATED SOLUTION• no more solute can be dissolved into the solution at a fixed • temperature• * any point ON the solubility curve3. 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

Solubility curve for KClO3

0

10

20

30

40

50

60

0 10 20 30 40 50 60 70 80 90Temperature (*C)

10 g

/ 10

0 g

Calculations using solubility curvesCalculations using solubility curvesUsing The Graph On the Previous Slide1. Is the solution saturated, unsaturated or supersaturated if there are 20g

of KClO3 at 30°C

2. Is the solution saturated, unsaturated or supersaturated if there are 5g of KClO3 at 50°C

3. Is the solution saturated, unsaturated or supersaturated if there are 20g of KClO3 at 50°C

4. 100 g H2O is saturated with KClO3 at 100°C. How much KClO3 will

come out of solution if the temperature is decreased to 48°C?

57 g-18 g = 39 g

Saturated

Unsaturated

Supersaturated