The standard solution is a reagent solution with an accurate known concentration, and the standard solution is expressed by the dose concentration of the substance, the symbol is c(B), the unit is mol·L-1, which means the amount of the substance (mol) contained in the solution per liter of titrant B as the basic unit. There are two methods for the extraction of the standard solution. It is mainly the direct preparation of the reference substance and the standard solution with known accurate concentration for calibration and extraction. The following is a small edition of Bolinda to introduce the conditions of the reagents used in the preparation of the standard solution.

Conditions for preparation of reagents used in standard solutions:

1, preparation of the standard solution used reagents, should be very stable in the solution, if volatile or side reactions, can be used to prepare the standard solution. Some solutions are susceptible to the effects of CO2 in the air or other side reactions, and appropriate stabilizers can be added.

2, the reagent used in the preparation of standard solution should be cheap and easy to obtain, easy to save, generally use AR reagent.

3, preparation of impurity standard solution, generally use GR reagent.

The above content is an introduction to the conditions of preparation of reagents used in standard solution, a variety of standard solutions must be prepared and stored according to their chemical properties, for unstable substances in dilute solution, a higher concentration of reserve liquid should be prepared before use, according to the requirements of the analytical method to prepare diluent liquid.