[T]

Hello,

I have been learning about acid dissociation constant and on chemistry sites such as chemguide.co.uk and others they imply that acid dissociation constant can only be used for weak acids. Have I misinterpreted their words or does the acid dissociation constant only apply to weak acids?

Thanks

[Hunter2]

All acids have that, but only on weak acids it has an effect, what means the acid is not 100% dissociated.

[thetada]

"Acids with a pKa value of less than about -2 are said to be strong acids; a strong acid is almost completely dissociated in aqueous solution, to the extent that the concentration of the undissociated acid becomes undetectable, which makes experimental calculations difficult."

Source: Boundless. “The Acid Dissociation Constant.” Boundless, 28 Jan. 2015. Retrieved 05 Apr. 2015 from https://www.boundless.com/chemistry/concepts/the-acid-dissociation-constant-0-6874/