Question

Given that one mole of sodium hydroxide reacts with one mole of hydrochloric acid, calculate the concentration of the hydrochloric acid.

Answer 1

If we have 1 L solution of NaOH and 1 L solution of HCl, then total volume will be 2 L.
Concentration = amount of solute in mol / volume
Concentration of the hydrochloric acid = 1mol/2L = 0.5 mol/L