During the reflux or concentration process, crystals often form on the inner walls of the flask above the liquid surface. These deposits can become firmly attached, making it difficult to continue the reaction and leading to discoloration over time due to poor thermal stability. To address this issue, gently shaking the flask can help re-dissolve the crystals by allowing the solution to penetrate them. However, if shaking is not possible due to equipment limitations, a cold, damp cloth can be applied to the upper part of the flask. As the solvent condenses along the walls, it helps dissolve the crystallized material, restoring the flask's usability. This method is particularly useful in situations where physical movement of the apparatus is restricted. Additionally, using a glass rod to gently scrape the crystals may also assist in their dissolution, ensuring the reaction proceeds smoothly. It’s important to monitor the temperature and avoid excessive heat, which could further damage the flask or the reaction components. Proper handling and careful observation during these processes are essential for successful outcomes.
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