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Answer :
Final answer:
When adding crystals to a capillary tube, capillary action can make them stick at the top due to adhesive forces between the liquid and tube molecules.
Explanation:
Capillary action, also known as capillarity or capillary motion, is a phenomenon where liquids move upward or downward in narrow tubes or porous materials due to the interplay of adhesive and cohesive forces. In the case of a capillary tube, the liquid wets the inner surface of the tube, and adhesive forces cause it to rise or fall, counteracting the force of gravity.
To ensure that crystals reach the bottom of a capillary tube, a simple technique can be used that leverages capillary action. First, make sure the capillary tube is clean and dry. Then, gently tap or flick the bottom of the tube to encourage any trapped air bubbles to rise to the top. This will help create an unobstructed path for the crystals. Next, carefully immerse the open end of the tube in the crystal solution.
As capillary action relies on the attractive forces between the liquid and the tube's surface, the liquid will begin to rise within the tube, pulling the crystals along with it. You can observe the crystals moving down the tube as the liquid level rises. The key is to start with an air bubble-free tube and let capillary action do the work to draw the crystals down to the bottom.
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