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Solubility Curves
Solubility CurvesSolubility
the maximum amount of substance that can dissolve in a given volume at a given temperature
Solubility CurvesSolubility Curve
Graphing solubility (y-axis) vs temperature (x-axis)
SaturatedSolute (g) per 100 g
H2O(l)
Temperature
Unsaturated
Supersaturated
On the line = saturated (full and cannot hold anymore solute)
Below the line = unsaturated (can hold more solute)
Above the line = supersaturated (holding more solute than it should, unstable condition)
Solubility CurvesExample A –
is this point unsaturated, saturated or supersaturated?
Solute (g) per 100 g
H2O(l)
Temperature
Solubility CurvesExample B –
is this point unsaturated, saturated or supersaturated?
Solute (g) per 100 g
H2O(l)
Temperature
Solubility CurvesExample C –
is this point unsaturated, saturated or supersaturated?
Solute (g) per 100 g
H2O(l)
Temperature
“Real” Solubility Curve
Calcium chloride (CaCl2) has a solubility of about 64 g CaCl2 per 100 g H2O at what temperature?
Answer: 10 °C
“Real” Solubility Curve
If we had 70 g of CaCl2 at 10 °C, would our solution be unsaturated, saturated or supersaturated?
Answer: supersaturated
“Real” Solubility Curve
How many grams of KCl is needed to make a saturated solution in 100g of H2O at 70 °C?
Answer: 49 g
“Real” Solubility Curve
Potassium chlorate (KClO3) is an unsaturated solution at 90 °C as long as the mass is under _____ g.
Answer: 40 grams
Practice Time with WKST
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