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The dark black solution is filtered through a gravity filtration system allowing the slightly pink liquid to pass through the fluted filter paper. This process can be slow to drain leave only the remaining insoluble impurities in the filter. Once the pure sample is collected the crystallization process begins. Sodium acetate buffer, to maintain a relatively constant pH and acetic anhydride is added to the solution of p-phenetidine in HCl. After mixing and boiling, the solution is placed on Ice where the Crystallization process begins. The crystals are collected in a vacuum filtration using a Buchner funnel...
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