Purification — Definition, Formula, Properties & Uses | AllChemicals | AllChemicals

Also Known As	Purification process, chemical purification, isolation and purification

What is Purification?

The process of separating a desired substance from contaminants. Techniques include recrystallization, distillation, chromatography, and extraction. Purity is assessed by melting point determination, spectroscopy, or titration. Pure substances are essential for accurate analytical results.

Properties & Characteristics

Purification in chemistry is the process of separating a desired substance from impurities to increase its purity. Common methods: distillation (volatile impurities), recrystallisation (solubility differences between product and impurities), column chromatography (differential adsorption), extraction (differential solubility in immiscible solvents), sublimation (for solid→vapour transitions), and preparative HPLC (for fine chemicals and pharmaceuticals). Purity is verified by melting point (sharp = pure), NMR, HPLC, or elemental analysis.

Uses & Applications

Purification is essential in: pharmaceutical API manufacturing (strict purity requirements, e.g., >99.5%), analytical chemistry (preparing pure reference standards), industrial chemical production (product quality specifications), biochemistry (enzyme and protein purification using chromatographic methods), and environmental analysis (sample clean-up before trace analysis).

Safety Information

Purification processes can concentrate impurities that may be more toxic than the product. Concentration of peroxides during distillation of ether can lead to explosive peroxide accumulation. Distillation of unknown or incompletely characterised compounds can lead to unexpected hazardous concentrations of impurities. Always identify potential hazardous impurities before beginning purification.

Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.

Key Facts

Term Purification

Index All "P" terms

Synonyms Purification process, chemical purification, isolation and purification

Frequently Asked Questions

What is Purification?

The process of separating a desired substance from contaminants. Techniques include recrystallization, distillation, chromatography, and extraction. Purity is assessed by melting point determination, spectroscopy, or titration. Pure substances are essential for accurate analytical results.

What is Purification used for?

Is Purification hazardous?

More "P" Terms

P-type Semiconductor Pairing Pairing Energy Palladium Pd Parachor [P] = M(γ)^(1/4) / (ρ_L - ρ_V) Paramagnetic χ_m > 0; unpaired electrons; μ = √(n(n+2)) BM (n = unpaired electrons) Paramagnetism Partial Ionic Character % ionic = (1 - e^(-Δχ²/4)) × 100% Partial Pressure Partial Pressure p_i = x_i × P_total; P_total = Σp_i Particulate Matter Parts Per Million ppm = mg/L (water) or mg/kg; = (mass solute/mass solution) × 10⁶

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