Question

Whose $pH$ increases by greater value on dilution from:

• $C{H}_{3}COOH$ solution
• $HCl$ solution

Answer 1

In dilution an acid reduces concentration of $H^{+}$ as a result $pH$ will increase. $HCl$ dissociates completely in water and thus gives more $H^{+}$ ions whereas acetic acid dissociates partially in water and thus gives less $H^{+}$ ions. Therefore $HCl$ solution gives higher $pH$ on dilution as decrease of $H^{+}$ concentration is higher than that of decrease of $H^{+}$ concentration for $C{H}_{3}COOH$.