Question

Given that H$_3$PO$_4$ has three acid-dissociation constants, K$_{a1}$, K$_{a2}$, and K$_{a3}$, what is the expected pH value at the second point of equivalence? ? pK$_{a1}$ ? pK$_{a2}$ ? (pK$_{a2}$+pK$_{a3}$)/2 ? (pK$_{a1}$+pK$_{a2}$)/2 ? pK$_{a3}$ ? (pK$_{a1}$+pK$_{a3}$)/2 ? (pK$_{a1}$+ pK$_{a2}$+pK$_{a3}$)/3

          Given that H$_3$PO$_4$ has three acid-dissociation constants, K$_{a1}$, K$_{a2}$, and K$_{a3}$, what is the expected pH value at the second point of equivalence?

? pK$_{a1}$
? pK$_{a2}$
? (pK$_{a2}$+pK$_{a3}$)/2
? (pK$_{a1}$+pK$_{a2}$)/2
? pK$_{a3}$
? (pK$_{a1}$+pK$_{a3}$)/2
? (pK$_{a1}$+ pK$_{a2}$+pK$_{a3}$)/3

Given that H3PO4 has three acid-dissociation constants, Ka1, Ka2, and Ka3, what is the expected pH value at the second point of equivalence?

? pKa1
? pKa2
? (pKa2+pKa3)/2
? (pKa1+pKa2)/2
? pKa3
? (pKa1+pKa3)/2
? (pKa1+ pKa2+pKa3)/3

Added by Adriana G.

Chemistry: Structure and Properties

Nivaldo Tro 2nd Edition

Instant Answer

Solved by Expert David Collins

04/14/2023

Step 1

The solution contains the amphoteric species HPO$_4^{-2}$. Show more…

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Given that H$_3$PO$_4$ has three acid-dissociation constants, $K_{a1}$, $K_{a2}$, and $K_{a3}$, what is the expected pH value at the second point of equivalence? pKa1 pKa2 (pKa2+pKa3)/2 (pKa1+pKa2)/2 pKa3 (pKa1+pKa3)/2 (pKa1+ pKa2+pKa3)/3