Question

Which volume of 2.0 M NaOH(aq) is needed to completely neutralize 24 milliliters of 1.0 M HCl(aq)?

Answer 1

In neutralization, first you need a reaction equation:

NaOH (aq) + HCl (aq) -> NaCl(aq) + H2O(l)
(1). (2)

You see, equal amounts of acid and base
Neutralizes each other.

Because n= c x V, you solve from equation c1 v1 = c2 V2
Volume V1. You can use millilitres in this calculation.