General Cleaning Steps for Glassware

Various glassware must be used in the experiment, and whether these glassware are clean or not will directly affect the accuracy of the experimental results. Therefore, the glassware must be cleaned thoroughly before the experiment.

General glassware, such as beakers, flasks, conical flasks, test tubes, and measuring cylinders, can be brushed with water from the outside to the inside using a brush to remove water-soluble substances, partially insoluble substances, and dust; If there are organic substances such as oil stains, they can be washed with cleaning powder, soap powder, or detergent. Use a brush dipped in cleaning powder or detergent to scrub, then rinse with tap water and rinse the inner wall 2-3 times with distilled or deionized water. The inner wall of a cleaned glass instrument should be able to be uniformly wetted by water without water streaks and without water droplets.

For glassware that is difficult to brush or cannot be cleaned with a brush, such as burettes, volumetric flasks, pipettes, etc., detergent is usually poured or sucked into a container and soaked for a period of time. The detergent in the container is then poured into a storage bottle for later use, and rinsed with tap water and deionized water.

Sintered glass filters must be cleaned immediately after use. For different types of sediment remaining in the sintered filter, appropriate detergents should be used to dissolve the solid sediment on the surface of the sand core. Then, the residual sediment in the sintered glass should be repeatedly washed away with detergent using a vacuum extraction method, and then rinsed with distilled water. The filter should be dried at 110℃ and stored in a dust-proof cabinet.