Aqueous solution of orthoboric acid can be titrated against sodium hydroxide using phenolphthalein indicator only in the presence of :
trans-glycerol
catechol
cis-glycerol
both (B) and (C)
Test of Phenol -
Phenols gives Violet solution with
- wherein
Violet Solution
It forms a stable cyclic complex with polyhydroxy compounds like cis-glycerol, cathechol, etc. This helps in the release of H+ as H3O+ and, therefore, boric acids acts as a strong acid and hence can be titrated with sodium hydroxide using phenolphathalein.