Compare and contrast a dilute solution of a strong acid and a concentrated solution of a weak acid

Answer 1

Both solutions may have the same pH,that is the same H+ concentration. However, in the dilute solution of a strong acid, there is present only the H+ and the counter ion (For example a dilute solution of HCl will contain

only H+ and Cl-). In a concentrated solution of weak acid, there is undissociated acid present.(For example, a concentrated solution of acetic acid,CH₃CO₂H will contain lots of undissociated acid in addition to H+ and

CH₃CO₂^{- .}