Volume of `0.1M HCI` required to react completely with 1g equimolar mixture of `Na_(2)CO_(3)` and `NaHCO_(3)` is

Volume of 0.1M HCl required to react completely with 1g equimolar mixture of Na_(2)CO_(3) and NaHCO_(3) is

(a) What is van't Hoff factor? What types of values it can have if the solute molecules undergo (i) Dissociation ? (ii) Association ? (b) How many mL of a 0.1 M HCl solution are required to react completely with 1 g of a mixture of Na_(2)CO_(3) and NaHCO_(3) containing equimolar amounts of both ? (Molar mass : Na_(2)CO_(3)=106g, NaHCO_(3)=84 g )