Reagent bottle usage and precautions

Reagent bottles are usually white and brown: brown reagent bottles are used to hold reagents or solutions that are easily separated by light, such as iodine solution, silver nitrate, potassium permanganate, potassium iodide, etc.

There are two types of reagent bottles, ground and non-ground: Generally speaking, non-abrasive reagent bottles are used to hold lye or concentrated salt solution. Rubber stoppers or corks are used to prevent reagents from crystallizing or dissolving glass, causing the stopper and bottle mouth to stick together, making it difficult to open. Grinding bottles contain solutions of acids, non-strongly alkaline reagents or organic reagents, etc. Less erosion to glass. When using, the original bottle should be fitted with the original stopper, and the number of the bottle and the stopper should be the same to facilitate sealing, so as to prevent the solution from evaporating and changing the concentration. When the reagent glass bottle is not in use, it should be cleaned and a piece of paper should be lined between the bottle mouth and the stopper to prevent them from sticking together after long-term use.

The reagent bottle can only be used to hold and store reagents: it cannot be used as a heating vessel, nor can it be used to fill quenching and sudden heating reagents, nor can it be used to prepare solutions and long-term storage of concentrated alkali and salt solutions. The reagent bottle has a large mouth and a small mouth. The big mouth is mainly used to hold solids, and the small mouth is used to hold liquids. Sizes range from 30ml to 20,000ml.

How to use: Choose a suitable volumetric flask. Check the volumetric flask for leaks. Fill the volumetric flask with a small amount of distilled water. After closing the stopper, turn the volumetric flask upside down. Rotate the stopper 180 degrees and close the lid. After steps 2-3, if no liquid leaks, it is ready to use.

Dissolution: By calculation, the mass of solute required to prepare the desired substance and concentrated solution is obtained, and the mass of solute is taken out. Dissolve the solute in the beaker with distilled water (note the operating specifications for different solutes). Wait for the solution to return to room temperature. Transfer the equal volume solution to a volumetric flask with a glass rod and rinse the beaker 4-5 times with distilled water. The wash solution also needs to be transferred to a volumetric flask. Gradually add water to the volumetric flask until the liquid level is 2-3 cm from the scribed line. Change to a rubber tip dropper and continue dripping until the concave level just touches the tick mark. Tighten the stopper and shake the flask moderately to mix the solution. Transfer the prepared solution to a reagent bottle for storage solution.