Investigating Solubility How Does The Solubility Of Potassium Chloride And Potassium Iodide In Water, Vary With Temperature?

1299 words - 5 pages

How does the solubility of Potassium Chloride (KCl) and Potassium Iodide (KI) in water vary with temperature?AimTo observe solubilities of KCl and KI with water at different temperaturesTo compare the two solubility curves and discuss what might vary the solubility of different ionic compounds.The variables
Dependent variable


Independent variable

Amount of solute (KCl, KI)


Amount of the solvent (water), pressure

Apparatus100g of Potassium Chloride100g of Potassium Iodide10ml cylinderTest tubes x 15StoppersGlass rodBeakers x 5Distilled waterSpatulaHot plateIce - to cool down the waterThermometer (0°C to 100°C) x 2MethodIn this experiment different amount of solute were combined with 10ml of water (solvent) which originally was at 0°C. The solvent and solute were mixed together and the temperature where the solute is completely dissolved to the solvent is measured.Weigh different amounts of KCl and KI
KCl - 6g, 7g, 8g, 9g, 10g (approx.)

KI - 12g, 14g, 16g, 20g, 25g (approx.)

Measure 10ml of water and place them into test tubesPlace the test tubes into ice and wait till they cool to 0°CStart dissolving the substances into cooled distilled water with the smallest amount of substancesUse a glass rod to stir or a stopper to shakeMeasure the temperature at where the substances are covmpletely dissolvedRepeat the process for each gram of the substances - use hot plates with water bath on top where appropriate to get higher temperature.Data collection and processingPotassium ChlorideWhen Potassium Chloride is completely dissolved in water, it becomes clear solution without any solid left in the solution.Trial 1
Amount of KCl

Temperature that KCl is dissolved

5.909 g ±0.1mg

7 °C ±0.1°C

Amount of water = 10cm3±0.1 cm3 x 2
= 20cm3±0.2 cm3

6.9990 g ±0.1mg

33°C ±0.1°C

8.480 g ±0.1mg

73°C ±0.1°C

9.309 g ±0.1mg


10.987 g ±0.1mg

Over 100°C ±0.1°C

Trial 2
Amount of KCl

Temperature that KCl is dissolved

Amount of water = 10cm3±0.1 cm3 x 2
= 20cm3±0.2 cm3

5.478 g ±0.1mg

6.5°C ±0.1°C

6.897 g ±0.1mg

30°C ±0.1°C

8.895 g ±0.1mg

78°C ±0.1°C

9.948 g ±0.1mg

90.5°C ±0.1°C

11.687 g ±0.1mg

Over 100°C

Trial 1 + Trial 2
Amount of KCl

Temperature that KCl is dissolved

Amount of Water = 20cm3±0.4 cm3
20cm3±0.2 cm3 + 20cm3±0.2 cm3
= 20cm3±0.4 cm3

5.6930 g ±0.2mg

6.75°C ±0.2°C

6.948 g ±0.2mg

31.5°C ±0.2°C

8.6875 g ±0.2mg

75.5°C ±0.2°C

9.6285 g ±0.2mg

88.5°C ±0.2°C

11.337 g ±0.2mg

Over 100

Amount of KI

Temperature that KI is dissolved

Amount of Water = 10cm3±0.1 cm3

12.995 g...

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