# Problem: 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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###### FREE Expert Solution

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) ###### Problem Details

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?