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Answer :
Final answer:
The capillary tube is inserted with the open end downward into the test tube to allow the unknown substance to be drawn up through capillary action. This technique is often used in chemistry labs.
Explanation:
In an experiment, the capillary tube is usually inserted into the test tube with the open end facing downwards. This is important as it allows the unknown substance in the tube to be drawn up into the capillary tube by capillary action.
This process occurs when the adhesive forces between the liquid and the walls of the capillary tube are stronger than the cohesive forces within the liquid. This is a common practice in chemistry labs, and is often used when determining the melting point of a substance, among other things.
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