Fehling's Test Simulator

Fehling's Test

A qualitative test distinguishing aliphatic aldehydes from ketones and aromatic aldehydes.

1. Setup Experiment

Select Unknown Compound

Acetaldehyde (Aliphatic Aldehyde) Benzaldehyde (Aromatic Aldehyde) Acetone (Ketone)

2. Observation

Physical State Clear Liquid

Status: Standby.
Select an organic compound and click "Add Fehling's Reagent". Fehling's A ($CuSO_4$) and Fehling's B (Rochelle salt) are mixed to form a deep blue complex.

3. Redox Chemistry

Aliphatic Aldehydes are easily oxidized to carboxylic acids.
Cu²⁺ ions (deep blue) are reduced to Cu⁺, forming insoluble Cu₂O (brick-red).

R-CHO + 2Cu²⁺ + 5OH⁻ →
R-COO⁻ + Cu₂O↓ + 3H₂O

Ketones & Aromatic Aldehydes generally do not react.

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