Recrystallization and Melting Point - Recrystallization and Melting Point Purpose To recrystallize solvents in order to purify solids and figure out the

Recrystallization and Melting Point - Recrystallization and...

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Recrystallization and Melting Point Purpose: To recrystallize solvents in order to purify solids and figure out the melting point. Procedure: Choose solvents with appropriate properties. In this case, it is benzoic acid. Measure out about 1.0 g of impure benzoic acid in 30-35 ml of hot water in 125 ml flask. Then dissolve the impure solid by weighing out crude solid into an Erlenmeyer flash while taking a melting point for reference. Make sure it completely dissolves. Add a boiling chip and use as minimum amount of hot solvent until it dissolves. If solvent is colored, add activated charcoal. There also might be insoluble materials, so gravity filter will be needed. Preheat the glass funnel to prevent any crystallization in the stem of the funnel and in the filter paper. Do not let the solution cool. After that, crystallize solute. Cool solution slowly by leaving it to cool by itself until room temperature then into ice bath. Collect the pure crystals by vacuum filtration. Rinse any pure crystals with a small amount of cold solvent. Finally analyze the product after letting the crystal
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