Solubility curvesSolubility curves

Class dataClass dataWrite down the data & answer questions on bottom of the sheet

Mass Temp Mass Temp

3 0 30

10 35

15 40

20 45 87

25 50 93

Mass Temp Mass Temp

3 0 30 69

10 28 35 76

15 40 40 83

20 52 45 87

25 60 50 93

Solubility curve for KClO3

0

10

20

30

40

50

60

0 10 20 30 40 50 60 70 80 90Temperature (*C)

10 g

/ 10

0 g

Results of lab: solubility of KClOResults of lab: solubility of KClO33

0

10

20

30

40

50

60

70

80

0 20 40 60 80 100

Temperature (oC)

g so

lute

per

100

g H

2O

Unsaturated

Saturated

3a i) 7

iii) unsaturated

ii) 14iii) 24 - 25

3b i) 30°Cii) 3°Ciii) 48°C

4 i) saturatedii) unsaturated

KNO3

Supersaturated4 i)

4 ii)

4iii)

Saturation and solubility curvesSaturation and solubility curvesIn this experiment we expressed concentration

in units of g solute / g H2OPutting concentrations in g solute / g solution

would be tedious and impracticalSee Fig 2 on pg. 316Notice that there are solubility curves for many

different substancesQ - Why do temperatures range from 0-100°CA - Water is a liquid at these temperaturesSolubility curves tell us how much solid will

dissolve at a given temperatureThey also allow certain calculations…

Calculations using solubility curvesCalculations using solubility curvesUsing fig 2 (pg. 316)5. 100 g H2O is saturated with KClO3 at 100°C.

How much KClO3 will come out of solution if

the temperature is decreased to 48°C?

How much would precipitate under the same circumstances if 350 g water were used

6.

57 g - 18 g = 39 g

(57 g - 18 g) x 3.5 = 137 g

(85 g - 21 g) x 1.5 = (64 g) x 1.5 = 96 g

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