H3C6H5O7 is a weak triprotic acid, meaning it can donate three protons (H+) and it will have three equilibrium reactions.
Ka1 = 7.4x10-4, Ka2 = 1.7x10-5, Ka3 = 4.0x10-7
Ka1 H3C6H5O7(aq) + H2O(l) ⇌ H2C6H5O7-(aq) + H3O+(aq)
Ka2 H2C6H5O7-(aq) + H2O(l) ⇌ HC6H5O72-(aq) + H3O+(aq)
Ka3 HC6H5O72-(aq) + H2O(l) ⇌ C6H5O73-(aq) + H3O+(aq)
Citric acid, which is present in citrus fruits, is a triprotic acid (Ka1 = 7.4x10-4, Ka2 = 1.7x10-5, Ka3 = 4.0x10-7). Is the concentration of citrate ion (C6H5O73–) equal to, less than, or greater than the H+ ion concentration?
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