Remove the Funnel from the 10-mL Erlenmeyer Flask, separate the plastic Parafilm from its wax-paper backing, and gently stretch the Parafilm and press it around the neck of the 10-mL Erlenmeyer Flask (to seal it so that vapors of 10% Sodium Carbonate cannot escape as you carry the container back from the Stock Fume Hood to your Fume Hood).

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