As both NaOH and HCl case, Molarity = Normality
Nbase x Vbase = Nacid X
Vacid
Nbase = 0.82 M and Vbase = ?
Similarily, Nacid = 0.62 M and Vacid = 112
mLÂ Â Â (given)
From above relation: 0.82 X Vbase = 0.62 x 112
                                       Â
Vbase = 0.62 x 112 / 0.82
                                       Â
Vbase = 69.44 / 0.82
                                       Â
Vbase = 84.68 mL