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

In summary, citric acid is a weak organic acid that is naturally found in citrus fruits and many other fruits and vegetables. It has a wide range of uses, such as being a preservative, flavor enhancer, cleaning agent, and component in cosmetic and pharmaceutical products. While generally considered safe in small amounts, consuming large amounts may lead to digestive discomfort and worsen symptoms for those with certain health conditions. It is not interchangeable with vinegar and can be produced through fermentation or chemical synthesis.
  • #1
vande060
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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

 
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  • #2
No, at pH 5.41, [HA2-] = [A3-]. 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.
 

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