Answer :
Final answer:
Packing a capillary melting-point tube involves picking up the open end of the tube, touching it to the substance you want to study to collect a sample, reversing the tube with the sample at the top, then tapping it gently to allow gravity to pack the sample down into the tube. Only a small amount of substance is needed.
Explanation:
The technique for packing a capillary melting-point tube is a crucial method used in Organic Chemistry lab, typically to determine the melting point of a substance. It can help identify an unknown compound or check the purity of a compound.
The correct steps are as follows:
- Pick up the open end of the capillary tube with a rubber tube or straw attached.
- Touch the open end of the capillary tube to the sample of the solid you want to study. The solid should stick to the glass.
- Reverse the capillary tube so the solid sample is at the top.
- Tap the sealed end of the tube gently on a hard surface, allowing gravity to pack the solid sample down into the bottom of the tube.
- The quantity of substance needed is small; only a few millimeters of material is typically necessary for an accurate melting point determination.
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