BME 100L. Modeling Cellular and Molecular Systems
Fall 2009
Homework 7
Chapter 4. Problems 10, 12, 13, 15, 16
Due: 5pm, November 9th
Hints
10.
At the standard state, calculate the Gibbs free energy change of the reaction after the following
reaction,
CO + 0.5O
2
CO
2
which is related to the ratio of partial pressures of the gases at equilibrium.
12.
The ionization constant pK is defined on page 159.
In part (e): the Gibbs freeenergy change = the change in
j
j
G
n
.
13.
The net charge of the solution is
j
j
j
c
zw
h
e
r
e
z
j
and c
j
are the charge and the concentration of j
th
ion. If the solution is electrically neutral, then the summation above must be equal to zero.
(b)
There are 7 species in the solution, H
3
PO
4
, H
2
PO
4

, HPO
4
2
, PO
4
3
, H
+
, Na
+
, and OH

(Note:
[NaOH] is negligible.) We need 7 equations to solve them.
At equilibrium, the 7 equations are as follows: three equilibrium constants K
1
, K
2
, K
3
that are
three equations relating concentrations of different species; one equation from (a); a known [H
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 Fall '07
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 equilibrium constants K1, Modeling Cellular and Molecular Systems Homework

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