Answer :
Using the titration formula, we get that:
(concentration of HBr)(25)=(0.5)(15.3)
This means the molar concentration of HBr is (0.5)(15.3)/25 = 0.31 M
(concentration of HBr)(25)=(0.5)(15.3)
This means the molar concentration of HBr is (0.5)(15.3)/25 = 0.31 M