Question #51815
1 Answer
The process in which solid crystals are deposited when the concentration of a solute in a solution increases past the point of saturation.
Explanation:
Methods of Crystallisation
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Occurs when the unsaturated solution becomes saturated and crystals form.
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Cooling a solution may reduce the solubility of a dissolved solute to the point where not all of the substance present is soluble.
- Evaporation of solvent from a solution
• Variables Affecting Crystal Growth
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Rate of Cooling of a Solution or Molten Compound
o Slow cooling = large crystals
o Rapid cooling = smaller crystals -
Rate of Evaporation of solvent
o Faster evaporation = smaller crystals -
Nucleation
o Nucleus = single seed crystal of the compound itself
o A small solid impurity can also act as a nucleus.
♣ E.g. dust/scratch on container -
Nature of the Compound
o Different compounds = different shaped crystals
Source: Heinemann Chemistry 1 (5th Edition)
