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Chemistry
Chemistry
Problem
Phosphoric acid has the following dissociation constants:
p
K
a
1
=
2.15
pK_{a1}=2.15
p
K
a
1
=
2.15
,
p
K
a
2
=
7.20
pK_{a2}=7.20
p
K
a
2
=
7.20
,
p
K
a
3
=
12.35
pK_{a3}=12.35
p
K
a
3
=
12.35
. Identify the predominant ionic species of phosphoric acid present in a solution at
p
H
=
9.0
pH = 9.0
p
H
=
9.0
(choose from
H
3
P
O
4
\mathrm{H_3PO_4}
H
3
P
O
4
,
H
2
P
O
4
−
\mathrm{H_2PO_4^-}
H
2
P
O
4
−
,
H
P
O
4
2
−
\mathrm{HPO_4^{2-}}
HP
O
4
2
−
, or
P
O
4
3
−
\mathrm{PO_4^{3-}}
P
O
4
3
−
).
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