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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Write down the data & answer questions on bottom of the sheet
3a i) 7
iii) 24 - 25
3b i) 30°C
4 i) saturated
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…
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
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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