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Panacetein Join now to read essay Panacetein 1.You will be given an unknown sample. Weigh it and use all of it. 2.For “Separation of Aspirin” on the middle of page 32, we will be using 5% sodium bicarbonate solution (NaHCO3), instead of 1M sodium hydroxide. Sodium hydroxide sometimes reacts with the ester group of aspirin..