Acid Dissociation Constant (Ka)

• Denoted by Ka

• A quantitative measure of how strong or how weak an acid is.

• For the hypothetical acid HA, dissociation equilibrium is:

HA(aq) + H2O(l) H3O+(aq) + A-(aq)

Ka =

[H3O+] x [A-]

[HA]

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