Question

NaOH should be added to 45.0 ml of HCL to completely neutralize the acid

Answer 1

Well, you need to add 45.0⋅mL of your standard NaOH solution precisely...........

Explanation:

And first we represent the reaction by an equation:

HCl(aq)+NaOH(aq)→NaCl(aq)+H2O(l)

And thus there is 1:1 stoichiometry.

We use the relationship Molarity=Moles of soluteVolume of solution.