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MCAT Question of the Day
Q:
Oxalic acid, H
2
C
2
O
4
, is a diprotic acid with a pKa value of 1.19. If 0.10 M oxalic acid is titrated 0.10 M NaOH, what would be the pH halfway to the first equivalence point? Relevant equilibria are given below:
H
2
C
2
O
4
+ H
2
O ↔ H
3
O
+
+ HC
2
O
4
-
(pK
a1
= 1.19)
HC
2
O
4
-
+ H
2
O ↔ H
3
O
+
+ C
2
O
4
-2
(pK
a2
= 4.21)
A
1.19
B
4.21
C
2.70
D
2.11
Acid/Base Equilibria
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