9. Predict whether the salt
NaHCO
3
will form an acidic or basic solution given
K
a
(H
2
CO
3
) = 4.3 x 10
-7
and
K
a
(HCO
3
-
) = 5.6 x 10
-11
.
Dissociation equations:
HCO
3
-
(aq)
H
+
(aq) + CO
3
2-
(aq)
HCO
3
-
(aq) + H
2
O (l)
H
2
CO
3
(aq) + OH
-
(aq)
Which is the correct equation for the
K
b
for
HCO
3
-
as seen in the reaction?
a)
K
b
(HCO
3
-
) = K
a
(H
2
CO
3
) x K
a
(HCO
3
-
)
b)
K
b
(HCO
3
-
) = {K
w
} / {K
a
(H
2
CO
3
)}
c)
K
b
(HCO
3
-
) = K
w
x K
a
(H
2
CO
3
)
d)
K
b
(HCO
3
-
) = K
w
/ {K
a
(HCO
3
-
)
