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Waste and cleanup
Waste and cleanup
All liquids go into the liquid waste carboy. All acetanilide, filter paper, pipets, and capillary tubes go into the solid waste box.
Check out the difference between the crude (top) and recrystallized (bottom) acetanilide!
Learning Objectives
Understand principles behind purification and recrystallization
Critical analysis of recrystallization technique
Analyze data to assess purity and success of experiment
Understand the role H-bonding plays in dissolving, precipitation, and melting point
Predict sources of intrinsic error and understand their effects on results
Main experimental stages:
dissolve
dissolve
hot filter
hot filter
cold filter
cold filter
Techniques
Dissolving solute in hot solvent
Gravity filtration
Crystallization
Vacuum filtration
Melting point analysis
Underlying Principles
Solubility & H-bonding
Role of activated charcoal in purification
Crystal lattice structures
Colligative properties - effects of impurities
What do you want to do next?
What do you want to do next?
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