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January 16, 2018

CHM 33900 Spring 2017

Name:_______________________
CHM 33900
Spring 2017
Homework #1
Due Friday January 20, 2017 in class
(30 points)
Please write neatly on this sheet! Show all your work and explain in complete sentences!
1. Fill in the table below:

HCl CCl4 H2O
Draw Lewis structure
All types of
intermolecular forces
in pure substance
Strongest type of
intermolecular force
in pure substance
Strongest type of
intermolecular force
with water (H
2O)

Based on the information in the table, which compound, HCl or CCl4, will be the most
soluble in water (H
2O)? Explain your answer.
2. Draw at least 2 water molecules hydrogen bonding with the molecule of methanol, CH3OH,
shown below. Draw dashed lines showing the hydrogen bonds between the molecules.
Explain in your own words what hydrogen bonding is.
3. Consider the following acid-base reaction:

____________
pK
a=4.75
___________ _____________ ____________
pK
a=9.25

a. Label the acid, base, conjugate acid, and conjugate base in the appropriate blanks
b. Draw the mechanism for the forward reaction using curved arrows and label the
electrophile and nucleophile in the reactants.
c. Does this reaction favor reactants or products at equilibrium? Explain why.
H C
H O
H H
O
H
O
N
H
H
H
O
O
N
H
H
H
H
+ +
4. Consider a 2.0 L buffer that is 0.35 M bicarbonate, HCO3-, and 0.55 M carbonate, CO32-. The
pKa of bicarbonate is 10.3.
a. What is the acid component of the buffer? What is the base component?
b. Calculate the pH of the buffer.
c. Write the reaction that occurs when strong acid is added to the buffer solution above.
d. Calculate the pH of the buffer after 5.0 mL of 6.0 M HCl is added.
e. Which component of the buffer would you add to restore the buffer to its original pH?

5. Blood is kept at a constant pH of 7.4 in part by the carbonic acid buffer system. The
chemical equation below represents this reaction:
CO
2 + H2O HCO3- + H3O+
a. Explain how the equilibrium would shift and how the pH would change if a person
was hypoventilating, which often occurs in people who have COPD. What would you
do restore the person’s blood pH to a normal level?
b. Sprinters often hyperventilate on purpose before a race. Why would this be
advantageous?
6. In a typical cell at 37°C which is not at equilibrium, the concentration of ATP = 6 x 10
–3 M,
ADP = 1.5 x 10
–3 M, and Pi (HPO4-2) = 7 x 10–3 M.
ATP + H
2O à ADP + Pi
a. What is the actual free energy change (ΔG’) for ATP hydrolysis under these
conditions? ΔG
0‘ for ATP hydrolysis = – 30 kJ/mol
b. Which direction will the reaction proceed under these conditions?

7. In biological systems, nonspontaneous reactions are often coupled with spontaneous
reactions to make them more favorable. Write the overall reaction and calculate the overall
value of ∆G°’ when the following two reactions are coupled:

Glucose + Pi à glucose-6-phosphate + H2O
ATP + H
2O à ADP + Pi
∆G°’= 9.6 kJ/mol
∆G°’= -30.5 kJ/mol

8. Draw a mechanism for this reaction. Label the electrophile and nucleophile. Draw the
leaving group as a product of the reaction on the line provided.
O
O
OH
O
H2O, H+
+

 

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