Titer of HCl 0.1 mol/L with Easy pH Titrator

tris(hydroxymethyl)aminomethane, also known as THAM or TRIS, serves as an excellent primary standard base. TRIS has a molecular weight of 121.14 g/mol.

TRIS is an excellent standard as it is non-hygroscopic in nature, does not absorb carbon dioxide from air, is stable both as the solid and in aqueous solution, can be prepared in very pure form, and can be dried at 100-103°C without decomposition. THAM reacts quickly and stoichiometrically with hydronium ion.

Reaction:

(HOCH₂)₃CNH₂ + HCl --------->   (HOCH₂)₃CNH₃⁺  + Cl^-

This application is used to standardize HCl titrant with Tris(hydroxymethyl)-aminomethane. The titration is monitored by potentiometric measurement with a pH sensor and the titration curve is evaluated at the inflection point to obtain the equivalence point (EQP)