Solubility CurvesSolubility Curves

The amount of a solute that The amount of a solute that will dissolve is a solvent will dissolve is a solvent

depends upon the depends upon the temperature of the solution.temperature of the solution.

KNOKNO33 dissolved in water dissolved in water• The data to the The data to the

right is how many right is how many grams of KNOgrams of KNO33 solid that will solid that will dissolve in 100ml dissolve in 100ml of water at of water at different different temperatures.temperatures.

TemperatureTemperatureMass Mass 00ooCC 15g15g 1010ooCC 23g23g 2020ooCC 34g34g 3030ooCC 47g47g 3838ooCC 60g60g

KNOKNO33 dissolved in water dissolved in waterThis graphs shows the relationship between how much solid potassium nitrate will dissolve in water at different temperatures. Notice how it is not a straight line, but curves upward. The hotter the water, the more potassium nitrate will dissolve.

Question?Question?How much PotassiumHow much PotassiumNitrate will dissolve atNitrate will dissolve at25 degrees Celsius?25 degrees Celsius?

Follow the line upFollow the line upfrom 25 degrees andfrom 25 degrees andthen over to the then over to the mass.mass.

Solubility Curve of NHSolubility Curve of NH33

Notice how the Notice how the curve is different curve is different from the solid from the solid potassium nitrate. potassium nitrate. The reason is The reason is simple, ammonia simple, ammonia (NH(NH33) is a gas. ) is a gas. Therefore it is Therefore it is less less soluble in hot soluble in hot water.water.

Saturated SolutionSaturated SolutionAny point on the line Any point on the line indicates a indicates a saturatedsaturatedsolution. Saturatedsolution. Saturatedmeans the solventmeans the solventhas dissolved as has dissolved as much solute as much solute as possible. possible.

Unsaturated SolutionUnsaturated Solution• The The red red area ofarea of the graph the graph represents an represents an unsaturated unsaturated solution. Less solution. Less solute is dissolvedsolute is dissolved than a saturated than a saturated solution.solution.

Supersaturated SolutionSupersaturated Solution• The The red red area ofarea of the graph the graph represents a represents a supersaturated supersaturated solution. More solution. More solute is dissolvedsolute is dissolved than a saturated than a saturated solution.solution.

Use this graph to help you Use this graph to help you answer the rest of the answer the rest of the

questions.questions.