Why does same concentration of HClsolution have lower pH than CH3COOH?
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pH value of HCl solution is less than that of acetic acid of the same concentration. HCl is strong acid and is completely dissociated. Acetic acid is weak acid and partially dissociated. Thus, hydrogen ion concentration is higher in HCl than in acetic acid. Lower is the pH, greater is the hydrogen ion concentration and greater is the acid strength. In equimolar solution, the number of titrable protons present in HCl is equal to that present in acetic acid.
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