Final answer:
In organic chemistry, the dryness of a solution is indicated by the behavior of fine particles and the specific drying agent used.
Explanation:
A solution is nearing dryness when fine particles are noticed that don't cling to other particles, or to the glass when swirled. Different drying agents like anhydrous Na₂SO4 work differently in indicating dryness. For example, if using anhydrous Na₂SO4, allow the solution to sit for at least 5 minutes before declaring it dry.
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