Chemistry 112
HNO
2
(
aq
)
+
H
2
O(
l
)
→
←
H
3
O
+
(
aq
)
+
NO
2
–
(
aq
)
K
a
=
[H
3
O
+
]
e
[NO
2
–
]
e
[HNO
2
]
e
Initial
0.0100
0
0
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