Welcome to Chem Zipper.com......: Titration of Boric Acid:

Search This Blog

Wednesday, December 18, 2019

Titration of Boric Acid:


Boric acid is a weak monoprotic acid (Ka=6.4×10−10). Therefore, it cannot be directly titrated with standard strong alkali (NaOH). But by the addition of an organic poly hydroxy compound such as 1,2- or 1,3-diol, (Like Sugar, Mannitol, Catechol)  it is converted to a much stronger acid, which can be titrated using phenolphthalein. This is due to the complex formation between hydrated borate ion and either 1,2- or 1,3-diol  for example .

Ploy hydroxy (Cis-diol) increases acidity of boric acid due to formation of complex with metaborate and reaction goes to farward to produce more H+.
IIT UPDATE: (2006):

No comments:

Post a Comment

Featured Post

Salicylic acid is a stronger acid than Benzoic acid. Why?

Salicylic acid is a stronger acid than benzoic acid. It is due to the fact that in salicylate ion (conjugate base of salicylic acid) intram...

Popular Posts