Solubility Curves Solubility the maximum amount of substance that can dissolve in a given volume at a given temperature

Solubility Curves Solubility Curve Graphing solubility (y-axis) vs temperature (x-axis) Saturated Solute (g) per 100 g H 2 O (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 Curves Example A – is this point unsaturated, saturated or supersaturated? Solute (g) per 100 g H 2 O (l) Temperature

Solubility Curves Example B – is this point unsaturated, saturated or supersaturated? Solute (g) per 100 g H 2 O (l) Temperature

Solubility Curves Example C – is this point unsaturated, saturated or supersaturated? Solute (g) per 100 g H 2 O (l) Temperature

“Real” Solubility Curve Calcium chloride (CaCl 2 ) has a solubility of about 64 g CaCl 2 per 100 g H 2 O at what temperature? Answer: 10 °C

“Real” Solubility Curve If we had 70 g of CaCl 2 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 H 2 O at 70 ° C? Answer: 49 g

“Real” Solubility Curve Potassium chlorate (KClO 3 ) is an unsaturated solution at 9 0 ° C as long as the mass is under _____ g. Answer: 40 grams

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