Question 4 : What is the conjugate base of
H
C
O
−
3
HCO3−
?
C
O
2
−
3
CO32−
H
2
C
O
3
H2CO3
OH^{-}
H
C
O
+
3
HCO3+
Question 5 : In the following reaction, which is a Brønsted-Lowry base?
H
C
2
O
−
4
(
a
q
)
+
H
2
O
(
l
)
→
H
3
O
+
(
a
q
)
+
C
2
O
2
−
4
(
a
q
)
HC2O4−(aq)+H2O(l)→H3O+(aq)+C2O42−(aq)
H
3
O
+
H3O+
H
2
O
H2O
None of these
H
C
2
O
−
4
HC2O4−
Question 6 : For the following reaction, which of the following is a conjugate acid-base pair?
H
2
P
O
4
−
(
a
q
)
+
N
H
3
(
a
q
)
→
H
P
O
2
−
4
(
a
q
)
+
N
H
+
4
(
a
q
)
H2PO4−(aq)+NH3(aq)→HPO42−(aq)+NH4+(aq)
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