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. Justify drug storage or use:

Ascorbic acid (FS 42-0218-07)
1.solubility in water
2.reaction for authenticity with silver nitrate
3.purity test: specific rotation, oxalic acid
4. quantitative determination, storage.