Thermodynamics

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28 Οκτ 2013 (πριν από 4 χρόνια και 8 μήνες)

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Equilibrium Due 3.11.08

Last name
______________________
First

_________________________

1.

(Due 3.6.08)

At 50°C, the solubility products of
Ag
2
SO
4

and
AgBrO
3

are 1.
20
•10
-
8
M and 5.38
•10
-
5
M, respectively. What are the values of [
Ag
+
],
[SO
4
2
-
]

and [
Br
O
3
-
],

in a solution at equilibrium
with both

substances
?

2.

By using the values of K
sp

for
ZnS, Zn(OH)
2

and K
f
for
Zn
(
OH
)
4
2
-
,

i) What is the molar solubility of ZnS?

ii) What is the molar solubility of Zn(OH)
2

in 0.10 M OH
-

?

iii) C
alculate the equili
brium constant for the following reaction:

ZnS

(s)
+

4OH
-
(aq)

Zn
(
OH
)
4
2
-

(aq)
+

S
2
-
(aq)

3.

Could the separation of Ca2+ and Ba2+ from Mg2+ be accomplished using 0.080 M sod
ium carbonate in
place of 0.080 M ammonium carbonate. Show quantitative why or why not.

4.

Nitric oxide and bromine, at initial pratial pressures of 98.4 and 41.3 torr, respectively, were allowed to react
at 300 K. At equilib
rium, the
total pressure
was 110.5 torr. The reaction is

2NO
(g)

+ Br
2(g)

2 NOBr
(g)

i) Calculate the partial pressure (torr) of NO, Br
2

and NOBr at equilibrium.

ii) Calculate the value of Kp

iii) Calculate Kc ?