What is the recommended volume of solvent per 1 g of crude product?

The recommended volume of solvent for recrystallization is typically around 3 mL per gram of crude product. This amount is considered optimal because it allows for sufficient solubility of the crude product when heated, while not using excessive solvent that could hinder crystal formation upon cooling. Using too little solvent may lead to saturation too quickly and might result in impurities being included in the crystals. Conversely, using too much solvent could mean that the solute is too dilute, lowering the yield of the crystallization process.

In laboratory practices, this guideline helps to achieve a balance between the purity of the isolated product and the efficiency of the process, ensuring that enough solvent is present to dissolve the compound but not so much that crystallization becomes less efficient.