Part 1: Solubility and Miscibility
a) Test the solubility of the following solids in solvents as follows:
Typical laboratory procedure:
To each test tube add a few granules of solid followed by solvent (1 mL). Stopper/bung and shake for 20-30 seconds (without inverting – keep the lid dry), then leave to settle.
-Potassium iodide in i) water ii) hexane
-iodine in i) water ii) hexane iii) dichloromethane
Video 1: Solubility of potassium iodide in water
Video 2: Solubility of potassium iodide in hexane video
Video 3 Solubility of iodine video
Water Hexane Chloroform
KI
Observation:
X
Conclusion:
X
I2
Observation:
Conclusion:
Notes on observations, technique and lab practice for Iodine video:
Notes on observations, technique and lab practice for potassium iodide video:
b) Test the following solvent mixtures for miscibility by adding 1 mL of each solvent in a test tube, sealing the tube, shaking to mix (10 seconds), and leaving to settle (10 seconds).
Video for water with ethanol, hexane and 1-butanol
Water/Ethanol Water/Hexane Water/1-butanol
Observation:
Conclusion:
Notes on observations, technique and lab practice for water/ethanol experiment:
Notes on observations, technique and lab practice water/hexane experiment:
Notes on observations, technique and lab practice for water/1-butanol experiment:
Is there a phase boundary? Where layers form, state in the table which solvent forms the upper/lower layer.
How could you confirm your answer with KI or iodine?
Where does the colour in the video reside? What does this prove about the solvents’ relative density and polarity?
