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(A.) 50 ml flask with 6ml 8% SDS and a small stir bar. The top is tightly covered with aluminum foil with a small hole poked in the center and a lead weight is placed around the flask. (B.) The flask is placed in a crystallizing dish with water. (C.) The top of the crystallizing dish is covered with aluminum foil with a hole in the center to accommodate the top of the flask.
