Glassware Heating Precautions
One: The heating process is a common step in physical and chemical analysis.
In actual work, some people often ignore or simply don't know which instruments can be heated, and even make mistakes. In fact, not all glass containers can be directly heated, such as measuring cylinders, measuring cups, volumetric flasks, reagent bottles, etc. Reaction vessels such as beakers, flasks, and triangular flasks should be used as appropriate. If you do not understand these basic knowledge in actual work, mistakes will inevitably occur, and even inspection accidents will occur.
Two: When heating the glass container, do not put the container on the asbestos mesh, but directly place the container in the electric furnace, so that the container is heated unevenly or even burst.
3. During use, the temperature changes too drastically, or the hot glass container that is quenched or removed at high temperature is directly placed on the table instead of being placed on the asbestos net as required, resulting in the rupture of the container and the loss of reagents, affecting the normal operation of the inspection work. .
Four: In actual work, some people are afraid of trouble and are not used to using the dryer correctly. For the heating device that needs to be accurately weighed, it should be dried and taken out after a little cooling (about 30s).
Put it in a desiccator to cool to room temperature and weigh it (30min is enough). When the warm appliance is put into the dryer, the cover should be left with a gap, wait for a few minutes, and then cover tightly; when moving the dryer, not only the lower part, but the cover should be moved to prevent the cover from slipping off, causing inconvenience. necessary loss.