Solubility Curves

Solubility Curves• A solubility curve (see Table G) shows the maximum

amount of solute that will normally dissolve in a given amount of a solvent over a range of temperatures

Solubility Curves

Solubility Curves• When a solvent has dissolved the maximum amount

of solute, it is saturated.

• All points that are on a solubility curve represent a saturated solution.

• When a solvent can still dissolve more solute, it is unsaturated.

• All points that are under a solubility curve represent an unsaturated solution.

Solubility Curves1) Which of the substances on the solubility curve

is the least soluble in water at 10oC? __________

2) Which of the substances on the solubility curve has the greatest increase in solubility as the

temperature increases from 30oC to 60oC? __________

3) Which of the substances on the solubility curve has its solubility affected the least by a change in temperature? __________

KClO3

KNO3

NaCl

Solubility Curves4) At what temperature will the two solutions

KNO3(aq) and NaNO3(aq), have the same solubility?

__________oC

5) What two substances have the same degree of solubility at approximately 28oC?

__________ and __________

6) How many grams of potassium chlorate can be added to 350 g of water at 70oC until the

maximum solubility is reached? __________ g

≈ 71

NH3 KNO3

≈ 126 - 130

Solubility Curves 7) Which substance on the solubility curve is the

most soluble at 20oC? __________

8) Why do the solubilities of HCl, NH3, and SO2 on the solubility curve decrease with an increase in temperature whereas the solubilities of all the other substances on Table G increase with an increase intemperature?

_________________________________________

_________________________________________

_________________________________________ 100oC. The solubility of a gas decreases as the

HCl, NH3, & SO2 are all gases between 0oC and

solvent’s temperature increases

KI