Reagent grade sodium tungstate, RG sodium tungstate for short, may be applied for precision analysis and scientific research. Reagent-grade chemical substances are labeled red.
There are a variety of chemical reagents, so that it is difficult to prepare them into multiple grades or different specifications at the same time. So, it is hard to obtain reagents of the required purity or grade sometimes. And therefore, it is of significance for users to know how to purify reagents.
There are many ways to purify reagents. And you should choose appropriate purification methods for different reagents. The following are some commonly used purification methods:
1. Distillation. It is the most commonly used purification method for volatile liquid or solid reagents such as inorganic acids and organic solvents, etc.
2. Recrystallization. It is suitable for most solid reagents.
3. Sublimation. It is of great convenience for some reagents which are easy to sublimate such as iodine, naphthalene, and so on.
4. Solvent extraction.
5. Ion exchange chromatography.
6. Paper chromatography.
In addition to the above methods, special methods such as electrodialysis, zone melting, and ion exchange membrane may also be used to separate and purify chemical reagents.
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