30 mL of 0.10 M NaOH neutralized 25.0

Question

mL of hydrochloric acid. Determine the
concentration of the acid

Answer 1

First, we need to determine the amount of moles of NaOH used in the neutralization reaction.

Moles of NaOH = Molarity x Volume
Moles of NaOH = 0.10 mol/L x 0.030 L
Moles of NaOH = 0.003 mol

Since the reaction is 1:1 between NaOH and HCl, the amount of moles of HCl used in the reaction is also 0.003 mol.

Now, we can use the amount of moles of HCl and the volume of HCl to calculate the concentration of the acid.

Concentration of HCl = Moles of HCl / Volume HCl
Concentration of HCl = 0.003 mol / 0.025 L
Concentration of HCl = 0.12 M

Therefore, the concentration of the hydrochloric acid is 0.12 M.