Answer to Question #108477 in General Chemistry for Beverlie

Question

1. What is the concentration of H+ ions in a solution of hydrochloric acid that was prepared by diluting 20.0 mL of concentrated (11.6 M ) HCl to a final volume of 500.0 mL? answer in M

Answer 1

[H+]=[HCl], because HCl is a strong acid in aqueous solutions

[HCl]=n_HCl/V_solution

V_solution=500.0ml=0.500L - the final volume of solution

n_HCl=11.6mol*L^-1*20*10^-3L=0.232mol

So, [H+]=[HCl]=n_HCl/V_solution=0.232mol/0.500L=0.464mol*L^-1 or 0.464M

Answer: 0.464M