78. Solving a chemistry problem

Explain the definition of solubility in accordance with conventional terms (FS), justify reactions to authenticity, purity testing, quantitative determination of drugs according to the regulatory documentation (FS) given in the Appendix. When describing reactions for authenticity, tests for purity, give the chemistry of reactions; for quantitative determination, give the chemistry of reactions, the derivation of the stoichiometric coefficient, the equivalence factor. Application and storage (taking into account the properties of functional groups):

Acetylsalicylic acid (GF Xll, FS 42-0220-07)
1. solubility in alcohol
2. reaction to authenticity
3. purity test: color of the solution, sulfates
4. quantitative determination, application.