Explain why Na2CO3 against HCL titration using phenolphthalein indicator does not go to completion but stops at the NaHCO3 stage.

Answer 1

I need help

Answer 2

Na2CO3 act as a weak base and HCl is a strong acid. Phenolphthalein is not a suitable indicator for titrating weak base against strong acid because the equivalence point of the titration will result in an acid salt(NaHCO3) which cannot go to completion. That is; the greater acidity of the acid overcomes the basicity of the base. Thus it will occur at a pH less than 7.
The chemical equation is given by;
Na2CO3 + HCl = NaHCO3 + NaCl.
By: *Ogidi Power*
(Gideon Nyarkoh)