Synthesis of Ammonium picrate

5 g of picric acid is dissolved in 100 mL of boiling water, then 5 mL of 25% aq. ammonia is added at a temperature of 90°C with constant stirring. The solution is evaporated to a volume of 40 mL and then allowed to cool to 5°C, filtered and washed with 50 mL of ice-cold water.

Source

Addition of the ammonia

  

Evaporation of the solvent

The refrigerated mixture

Filtration

The pure product

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