Question

what happen when sodium hypochlorite mix with sodium bicarbonate mixtures

Answer 1

The hypochlorite ion, ClO- is the conjugate base of a weak acid, HClO.

The hydrogencarbonate ion, HCO3- is the conjugate acid of a weak base, CO32-.

Now, I don't know the relative pKa values of the two species, but it may be possible for the two to react together in a neutralisation reaction:

HCO3- + ClO- --> CO32- + HClO