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[Chemical Knowledge]：Sodium borohydride preparation solution matters needing attention

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Sodium borohydride (NaBH4) is a commonly used reducing agent used in organic synthesis and laboratory research. The preparation of NaBH4 solution is one of the common operations in the laboratory, but due to its strong reducibility and sensitivity to water, the following items should be paid attention to to ensure the safety and success of the solution preparation.

1. Select the appropriate experimental conditions to
the preparation of NaBH4 solution needs to be carried out under dry conditions, so you should choose a dryer or dry nitrogen ventilation laboratory bench for operation to ensure that the operating environment is dry and anhydrous.

2. Wearing Personal Protective Equipment
When preparing NaBH4 solution, wear chemical protective glasses, laboratory coats and gloves to prevent the solution from splashing or touching the skin and eyes and causing injury.

3. Slow addition of NaBH4
When NaBH4 is added to the solvent, it should be added slowly and stirred at the same time to avoid splashing or overflow of the solution caused by excessive reaction, and bubbles should be avoided so as not to affect the concentration and stability of the prepared solution.

4. Avoid high temperature and fire source
NaBH4 is sensitive to heat and is easy to decompose at high temperature to produce hydrogen, which is flammable and explosive. Therefore, when preparing the solution, it is necessary to stay away from open flame and high temperature source, and pay attention to prevent the temperature of the solution from rising.

5. Pay attention to the solution concentration and storage
. The prepared NaBH4 solution should be diluted to the specified concentration in strict accordance with the experimental requirements, and should be stored in a sealed container and placed in a cool and dry place to avoid exposure to air or sunlight to extend the stability and validity of the solution.

6. Treatment of waste solution The waste solution produced after
preparation of solution contains NaBH4, which needs to be professionally treated and cannot be directly poured into sewers or garbage cans. It should be treated in accordance with laboratory waste liquid treatment regulations.

Through strict compliance with the above precautions, the safe preparation and use of NaBH4 solution can be ensured, and the accuracy and repeatability of experimental results can be guaranteed. It is hoped that during the experiment, every experimenter can strictly abide by the operating procedures and protect the safety of himself and the laboratory.