Choosing the Right Solvent for Extraction & Synthesis

Solvents are the workhorses of chemistry — and choosing the right one can be the difference between a clean, efficient process and a failed one. This guide walks through the key properties to weigh when selecting a solvent for extraction, synthesis or cleaning.

Key properties to consider

• Polarity — “like dissolves like”: polar solvents dissolve polar compounds, non-polar dissolve non-polar. Matching polarity is the first step.
• Boiling point — affects how easily the solvent is removed afterwards (e.g. by rotary evaporation).
• Miscibility — whether the solvent mixes with water matters for extractions and work-up.
• Volatility & safety — flammability, toxicity and evaporation rate.

Common solvents and their strengths

• Acetone — polar, fast-evaporating, water-miscible; excellent for cleaning and general lab use.
• Ethyl acetate — moderately polar; a favourite for extractions and chromatography.
• Petroleum ether / hexane — non-polar; ideal for dissolving oils and fats.
• Carbon disulfide, THF, pyridine — specialist solvents for particular reactions.

Solvent selection for common tasks

For liquid-liquid extraction, choose a water-immiscible solvent with the right polarity (e.g. ethyl acetate). For recrystallisation, pick a solvent that dissolves your compound when hot but not cold. For cleaning, fast-evaporating acetone is hard to beat.

Purity matters

Use reagent or ACS grade for analytical and synthetic work, where impurities can interfere with results. Request a Certificate of Analysis (COA) to confirm the specification.

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