Purification and Characterisation of Organic Compounds – Interactive Quiz & Cheatsheet

Master the techniques for purifying and identifying organic compounds with this engaging quiz and guide

Updated: just now

Categories: Mini Game, Chemistry, Class 11, Organic Chemistry
Tags: Mini Game, Chemistry, Class 11, Purification, Characterisation, Organic Compounds, Chromatography, Distillation
Post Thumbnail
Purification and Characterisation of Organic Compounds Cheatsheet & Quiz

Purification and Characterisation of Organic Compounds Cheatsheet

Cheat Codes & Shortcuts

  • Definition: Purification isolates a compound; characterisation determines its structure and properties.
  • Crystallisation: Dissolve in hot solvent, cool to form crystals.
  • Distillation: Separate based on boiling point differences.
  • Chromatography: Separates based on differential adsorption or partitioning.
  • Melting Point: Indicates purity; sharp for pure compounds.
  • Boiling Point: Used for liquid identification and purity check.
  • IR Spectroscopy: Identifies functional groups via absorption bands.
  • NMR Spectroscopy: Provides structural info via proton or carbon signals.
  • Mass Spectrometry: Determines molecular weight and structure.
  • Elemental Analysis: Confirms molecular formula via C, H, N percentages.

Quick Reference Table

Technique Principle Application
Crystallisation Dissolve in hot solvent, cool to crystallise Purify solids like benzoic acid
Simple Distillation Boiling point difference > 25°C Separate ethanol from water
Column Chromatography Differential adsorption on stationary phase Separate plant pigments
IR Spectroscopy Absorption of IR by functional groups Identify C=O, O-H bonds
NMR Spectroscopy Resonance of nuclei in magnetic field Determine C-H framework
Mass Spectrometry Ionisation and mass-to-charge ratio Find molecular weight

Advice

First Step: Choose purification method based on compound properties (solid/liquid, solubility).

Solvent Selection: For crystallisation, use solvent where compound is soluble when hot, insoluble when cold.

Check Purity: Use melting/boiling point; impure compounds have broader ranges.

Spectroscopy: Combine IR, NMR, and MS for complete structural analysis.

Verify: Cross-check results with elemental analysis for molecular formula.

Purification and Characterisation Quick Tips

  • Crystallisation: Use minimum hot solvent for best yield.
  • Distillation: Fractional for close boiling points (<25°C difference).
  • Chromatography: Adjust solvent polarity for better separation.
  • IR Spectroscopy: Look for characteristic peaks (e.g., 1700 cm⁻¹ for C=O).
  • NMR: Use integration and splitting to deduce structure.

Purification and Characterisation Speed Quiz

Test your speed with 5 purification and characterisation questions! You have 30 seconds per question.