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Solubility curves. Class data. Write down the data & answer questions on bottom of the sheet. Results of lab: solubility of KClO 3. KNO 3. 3a i) 7 . Unsaturated. ii) 14. Supersaturated. 4 i). iii) 24 - 25. Saturated. 3b i) 30 °C. 4 ii). ii) 3 °C. 4iii). iii) 48°C.

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Presentation Transcript
class data
Class data

Write down the data & answer questions on bottom of the sheet

results of lab solubility of kclo 3
Results of lab: solubility of KClO3

KNO3

3a i) 7

Unsaturated

ii) 14

Supersaturated

4 i)

iii) 24 - 25

Saturated

3b i) 30°C

4 ii)

ii) 3°C

4iii)

iii) 48°C

4 i) saturated

ii) unsaturated

iii) unsaturated

saturation and solubility curves
Saturation and solubility curves

In this experiment we expressed concentration in units of g solute / g H2O

Putting concentrations in g solute / g solution would be tedious and impractical

See Fig 2 on pg. 316

Notice that there are solubility curves for many different substances

Q - Why do temperatures range from 0-100°C

A - Water is a liquid at these temperatures

Solubility curves tell us how much solid will dissolve at a given temperature

They also allow certain calculations…

calculations using solubility curves
Calculations using solubility curves

Using 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

For more lessons, visit www.chalkbored.com

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