The chemical stability of the glass condenser is good, but it is not absolutely free from erosion, but its degree of erosion meets certain standards. Analytical ions, which are traces of ions entering the solution and adsorbing solutions on the glass surface due to the glass condenser being eroded,are a concern for microanalysis. Therefore, there is a certain amount of taboo in the use of glass,whether it is used or washed or stored. We must know!
For example, hydrofluoric acid corrodes the glass very strongly.so experiments with hydrofluoric acid cannot be performed with glass instruments. Alkali, especially concentrated or hot lye glass significantly corrodes.The glassware that stores lye will not be opened if it is a grinding mouth.Therefore,the glass container cannot store lye for a long time. . . . .
The glass instrument is a consumable product, and its management and analysis instruments have basically the same general management requirements, ie they are required to be stored in cabinets.classified and positioned. Storage should be scientific and clean. Otherwise, not only will the experimental efficiency be undermined, but it will also lead to a decrease in the reference of experimental data. This article teaches you how to wash and preserve different types of glass instruments.
1 Flat-bottomed glass instruments, such as volumetric flasks, graduated cylinders, flat-bottomed flasks, reagent bottles, drop bottles, etc. If the number is small, they can be placed high behind and short in front, and the storage order can be disrupted in a cabinet. Glassware such as beakers. measuring cups, funnels, etc., shall be buckled in the cabinet for dust prevention. Round-bottomed flasks, conical flasks, etc. can be made with holes in the partitions of the cabinet, and they are inserted into the holes, which is dustproof and stable. When placing glass instruments, they must be separated by a certain distance to avoid collision damage.
2 Small glass instruments, such as densitometers, thermometers, plastic droppers, and drying tubes, should be placed in drawers, and cotton yarns should be placed under them to prevent them from rolling. Test tubes, burettes, pipettes, separatory funnels, safety funnels, etc. should be placed in special compartments and placed in instrument cabinets. Labels should be placed outside the compartments.
(3) Abrasive vessels, such as volumetric flasks, reagent bottles, separatory funnels, acid burettes, drop bottles, etc., should be filled with a piece of paper between the grinding mouth and the cock (or cork) after washing to avoid the day. Long bond, difficult to open. For a vitreous glass instrument, use a rubber band to store the vitreous plug and the instrument together during storage to avoid mismatch during use.
4Glass complete sets of equipment such as gas generators, the main and accessories must be put together to prevent mistakes or loss. The burettes, pistons, etc. should be coated with Vaseline on the glass stopper to prevent leakage and easy rotation.