Is Citric Acid Fully in Conjugate Base Form at pH >5.41?

[vande060]

Homework Statement

just a curosity of mine. citric acid is triprotic, with a pKa3 of 5.41, so does this mean that i will be inf ull conjugate base form(3-) at solution pH >5.41

Homework Equations

The Attempt at a Solution

 

[Borek]

No, at pH 5.41, [HA^2-] = [A^3-]. It always works this way.

Check out this page: titrations.info/acid-base-titration-indicators

While discussion there is about pH indicators, equation 2 describes every weak acid you can think of.