Determination of Initial Melting Point of Anthraquinone (AQ) Dry Products

The dry initial melting point of anthraquinone (AQ) can be determined by the following steps:

1. Prepare the sample: Take an anthraquinone sample of about 1-2 mg and place it in the center of a clean, dry melting point tube.

2. Device experiment: Put the melting point tube into the melting point apparatus and heat it to the room temperature before starting to heat up.

3. Start heating up: start the melting point apparatus and raise the temperature at a slow speed (generally 1°C/min).

4. Observe the melting phenomenon: When the sample starts to melt, tiny droplets appear. As the temperature increases, the droplets will gradually grow and merge to form a complete liquid state. At this time, record the temperature displayed by the melting point apparatus, which is the initial melting point of the dry product of anthraquinone.

Beichao reminds you: the drying and weighing of anthraquinone samples should be accurate, and the melting point tube should be clean and free of impurities. The heating rate should be moderate, too fast heating rate will lead to too high melting point, and too slow heating rate will lead to too low melting point. When observing the melting phenomenon, careful observation is required to avoid misjudgment or misreading.