KNO
2
(
aq
) + H
2
O(
l
)
KNO
2
(
aq
) → K
+
(
aq
) + NO
2
–
(
aq
)
NO
2
–
(
aq
) + H
2
O(
l
)
→
←
HNO
2
(
aq
) + OH
–
(
aq
)