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Chemistry
Chemistry
Problem
Phosphoric acid is a triprotic acid with
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
, and
p
K
a
3
=
12.35
pK_{a3}=12.35
p
K
a
3
=
12.35
. What is the predominant ionic form of phosphorus in an aqueous buffer maintained at
p
H
=
9.1
pH = 9.1
p
H
=
9.1
? a)
H
2
P
O
4
−
\mathrm{H_2PO_4^-}
H
2
P
O
4
−
b)
H
P
O
4
2
−
\mathrm{HPO_4^{2-}}
HP
O
4
2
−
c)
H
3
P
O
4
\mathrm{H_3PO_4}
H
3
P
O
4
d)
P
O
4
3
−
\mathrm{PO_4^{3-}}
P
O
4
3
−
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