# 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?

###### 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)

93% (3 ratings) ###### 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?

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Our tutors have indicated that to solve this problem you will need to apply the Polyprotic Acid concept. You can view video lessons to learn Polyprotic Acid. Or if you need more Polyprotic Acid practice, you can also practice Polyprotic Acid practice problems.

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Based on our data, we think this problem is relevant for Professor Ahiahonu's class at University of Saskatchewan.