Unit 9 solubility curves

Unit 9 solubility curves

By Katie Smit

​•Shows the maximum

•number of grams that

•can be dissolved in 100g

•of H2O at specific

•temperatures

•Most show increasing solubility as temperature increases, but a few don’t

–These are gaseous NH3, HCl, SO2

–Gases decrease in solubility as temperature increases

•Where the curves intersect, shows where those solutions are equally soluble

​Table G

Multiple Choice

Which of these solutes does not increase in solubility as temperature rises?

• NH₃
• NaNO₃
• KNO₃
• NaCl

Multiple Choice

How many grams of K₂Cr₂O₇, are soluble in 100 g of water at 95 ºC?

• 83 grams
• 75 grams
• 40 grams
• 12 grams

Multiple Choice

At what temperature can you fully dissolve 120g of NaBr?

• 80

• 20

• 100

• You cannot determine this

ANY SOLUTION CAN BE MADE SATURATED, UNSATURATED, OR SUPERSATURATED BY CHANGING THE TEMPERATURE.

SOLUBILITY CURVE

Points B and C

•Points of saturation (anywhere on the line)

•Saturated solutions

​

Points A and E

•Supersaturated solutions

​

Point D

•Unsaturated solutions

Temperature (°C)​

Solubility Curves

Grams of solute per 100g of H2O

Open Ended

If you heat a saturated solution, it will become _______________.

Open Ended

If you cool a saturated solution, it will become _______________.

Multiple Choice

25 grams of NaCl are dissolved in 100 mL of water at 60 C. How many more grams need to be dissolved for the solution to be saturated?

• 13 grams

• 25 grams

• 6 grams

• 38 grams

Multiple Choice

How much KNO₃ solute is saturated at 40 degrees?

• 75

• 55

• 65

• 85

Multiple Choice

How much C₁₂H₂₂O₁₁ solute is saturated at 40 degrees?

• 240

• 220

• 230

• 250

Multiple Choice

How much NaBr solute is saturated at 70 degrees?

• 110

• 120

• 130

• 140

Multiple Choice

Which solute is MOST likely a gas?

• KNO₃

• NaNO₃

• KCl

• Ce₂(SO₄)₃

Multiple Choice

What type of a solution is 60g NaNO₃ at 40ºC in 100g H₂O?

• Saturated

• Unsaturated

• Supersaturated

Multiple Choice

What type of a solution is 260g sugar at 50ºC in 100g H₂O?

• Saturated

• Unsaturated

• Supersaturated

Multiple Choice

At approximately what temperature does the solubility of sodium chloride, NaCl, match the solubility of potassium dichromate, K₂Cr₂O₇?

• 60 ºC

• 30 ºC

• 50 ºC

• 83 ºC

Multiple Choice

Which substance is MOST soluble at 0 ºC?

• KI
• NaNO₃
• NaCl
• Ce₂(SO₄)₃

Multiple Choice

Which solute is the least soluble at 90 ⁰C?

• SO₂
• KClO₃
• KI
• HCl