Question

Crystallization is primarily used to:

• A. Increase reaction rate
• B. Separate solids based on density
• C. Purify solids from solution
• D. Reduce particle size

Hint:

Logic Tip: Think of making rock candy. You dissolve sugar (solute) in hot water (solvent) and let it cool. Pure sugar crystals grow on the stick, leaving any food coloring or impurities in the water. You are "purifying the solid from the solution."

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
Crystallization is a mass transfer operation where a chemical is transferred from a liquid solution to a pure solid crystalline phase.
Step 2: Key Formula or Approach:
The process relies on the difference in solubility of the solute at different temperatures or concentrations.
Step 3: Detailed Explanation:
Crystallization is one of the most important industrial processes for producing high-purity chemicals. By carefully controlling the cooling or evaporation of a saturated solution, the desired substance forms highly ordered crystals, leaving impurities behind in the remaining liquid (mother liquor). It is a "purification" step because the crystal lattice structure naturally excludes foreign molecules.
Step 4: Final Answer:
Crystallization is primarily used to purify solids from solution.