Various titrimetric methods are available for estimation of acids and bases,
except very weak acids and bases which can only be estimated by either non-aqueous
methods of titration or potentiometry. Non-aqueous means of titrimetric analysis
involve the conversion of weak acid to a strong acid or weak base to a strong base by
exerting differentiating effect when dissolved in a basic or acidic solvent. The endpoint
of the titrations is determined via non-aqueous indicator solutions such as Crystal
violet, Nile blue A, 1-Naphtholbenzein, Oracet blue B.