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Organic Chemistry I (ChHE 223) Recrystallization Lab Report

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Lab Report 1

University

Pace University

Course

Organic Chemistry I (CHE 223)

CHE 223 Lab Report
Ysatis M. Fenner
Title:
Recrystallization of Benzil
Preformed: September 28th, 2018
Submitted: October 8th, 2018
Abstract:
 In organic chemistry, the most important method of purifying a solid is
crystallization. This experiment involved performing the steps of crystallization
using the solid Benzil with methanol. The goal of this experiment was to purify
the rudimentary compound of Benzil which will be done using a laboratory
technique known as recrystallization. The seven steps of crystallization include
choosing a solvent, dissolving the solute, decolorizing the solution, filtration,
crystallization, collecting and washing the crystals, and drying the crystals.
In this technique crystals are dissolved in methanol as the solvent, which is then
filtered and cooled until the crystals re-solidify. The crystals were purified with a
percent recovery. The percentage yield was 0.88 g.
Objective:
 To use the technique of recrystallization, to recrystallize the impure sample of
Benzil using methanol as the solvent.
Introduction:
Recrystallization is the most important method for the purification of solid
organic compounds. A crystalline organic substance is made up of a threedimensional
array of molecules held together primarily by van der Waals forces.
The products of chemical reactions can be impure. Purification of your products
must be performed to remove by-products and impurities. Liquids are customarily
purified by distillation, while solids are purified by recrystallization (sometimes
called simply “crystallization”). Recrystallization is a method of purifying a
solid. There are two types of impurities:

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Organic Chemistry I (ChHE 223) Recrystallization Lab Report

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