The balanced equation for the reaction between Ba(OH)₂ and HCl is as follows; Ba(OH)₂ + 2HCl ---> BaCl₂ + 2H₂O stoichiometry of Ba(OH)₂ to HCl is 1:2 the number of HCl moles that have reacted - 0.2452 mol/L x (20.00 x 10⁻³ L) number of HCl moles reacted = 0.004904 mol 2 mol of HCl reacts with 1 mol of Ba(OH)₂ therefore 0.004904 mol of HCl reacts with - 1/2 x 0.004904 mol of Ba(OH)₂ number of Ba(OH)₂ moles in 18.15 mL - 0.002452 mol Therefore number of Ba(OH)₂ moles in 1000 mL- 0.002452 mol /(18.15 x 10⁻³ L) molarity of Ba(OH)₂ is = 0.1351 M
