Answer :

Final answer:

To fill a capillary tube with benzoic acid crystals, melt the acid and use capillary action to draw the liquid into the tube. The procedure is not mentioned in the provided information, indicating that the student may need additional context or instruction on filling capillary tubes with substances such as benzoic acid.

Explanation:

To fill a capillary tube with benzoic acid crystals, you will generally need to employ a technique known as capillary action. However, it should be noted that if the benzoic acid is in crystal form, it first needs to be melted to allow for capillary action to occur. Unfortunately, based on the information provided, you seem to be referring to various laboratory procedures that do not directly relate to the filling of a capillary tube with benzoic acid crystals. If melting is necessary, benzoic acid can be gently heated until it liquefies and then introduced to one end of the capillary tube which is then placed in contact with the liquid acid. Capillary action will draw the liquid up into the tube.

Typically, it is important to avoid the introduction of air bubbles, and if the substance is sensitive to heat, it must be melted carefully to prevent decomposition. Once the capillary tube is filled, it can be allowed to cool, and the benzoic acid will solidify in the tube. It's critical to follow all safety precautions when handling chemicals and working with heat sources in a lab setting.

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