How do we can standardize primary standard solutions?i need a detailed answer with examples.?
By definition, a primary standard is not standardised. It is accepted as a standard. A primary standard in chemistry is a reliable, readily quantified substance. Features of a primary standard include: 1. High purity 2. Stability (low reactivity) 3. Low hygroscopicity and efflorescence 4. High solubility (if used in titration) 5. High equivalent weight 6. It should be nontoxic 7. It should be readily available (inexpensive) 8. It should be environmentally friendly * the last three are not as essential as the first five Some examples of primary standards * Arsenic trioxide for making sodium arsenite solution for standardisation of sodium periodate solution (until Ph. Eur. 3, Appendix 2001 also for iodine and cerium(IV) sulfate solutions, since Ph. Eur.
