Chemistry 112
Step 1
H
3
PO
4
(
aq
)
+
H
2
O(
l
)
→
←
H
3
O
+
(
aq
)
+
H
2
PO
4
–
(
aq
)
K
a1
=
[H
3
O
+
]
e
[H
2
PO
4
–
]
e
[H
3
PO
4
]
e
= 7.1×10
–3
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