Question

When a solution of HCl is exactly neutralized by NaOH, the number of moles NaOH used will equal what?

a) The number of moles of HCl
b) Twice the number of moles of HCl
c) Half the number of moles of HCl
d) Zero

Answer 1

The number of moles of NaOH used will equal the number of moles of HCl used.

Step-by-step explanation:

The number of moles of NaOH used will equal the number of moles of HCl used. This is because the balanced chemical equation for the neutralization reaction between HCl and NaOH is:

HCl(aq) + NaOH(aq) → NaCl(aq) + H₂O(l)

From the equation, we can see that the mole ratio of HCl to NaOH is 1:1. So, for every mole of HCl used, an equal number of moles of NaOH will be used.