What is the composition of Caffey reagent?
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Karl Fischer reagent: Single set – pyridine-free, F≥3, 500ml; Ethyl acetate solution: pyridine-free, F≥3, 500ml*2; A+B solution: pyridine-free, F≥3, 500ml*2. What does this notation for the reagents mean?
F should represent the titration value, that is, mg of water per mL; 500 mL is the volume in which this reagent is packaged, which corresponds to the amount contained in a standard liquid reagent bottle. A single-component reagent means one that can be used directly； For Reagent A and Reagent B, the two reagents need to be mixed in a 1:1 ratio just before use. Carbol reagent has a strong water-absorbing property; once the container is opened, it should be used up in a single experiment as much as possible, as it is not suitable for storage. When storage is necessary, it must be kept in a cool and dry place. Dryness here refers to an environment as close as possible to being free of moisture.