Reading solubility curves

Reading solubility curves

How to determine saturation levels and specific components of solutions.

Solubility Curves

Solubility curves show the saturation level (saturated, unsaturated, or super saturated) of a sample solution as compared to the standard saturation curve for the amount of solute dissolved in a specific amount of solvent.

Solubility curves can also used to determine the temperature needed to create a saturated solution with a specific amount of solute. Conversely, the amount of solute (g) to make a saturated solution can be determined by looking at the temperature on a standard curve.

Multiple Choice

Which solute is the most soluble at 10 ⁰C?

• KI

• NH₃

• KClO₃

• NH₄Cl

Multiple Choice

John dissolves 54 grams of a solute in a solution he has gently heated near boiling. After a couple of hours he checks the temperature and finds that only 48 grams of solute should dissolve at the present temperature. The solution appears normal otherwise. What type of solution has John made?

• unsaturated

• saturated

• super saturated

• unable to determine

Multiple Choice

How many grams of SO₂ can dissolve at 50 ⁰C?

• 5 g

• 10 g

• 20 g

• 39 g

Multiple Choice

What is the maximum temperature where at least 60 g of HCl can dissolve?

• 35 ⁰C

• 45 ⁰C

• 55 ⁰C

• 65 ⁰C

Multiple Choice

How would you describe a solution where the plotted point falls below the line on a solubility curve?

• saturated

• unsaturated

• super saturated

Multiple Choice

Which salt is LEAST soluble at 0 ºC?

• KNO₃

• Ce₂(SO₄)₃

• K₂Cr₂O₇

• KClO₃