Name ______________________
CHEM 1474
Quiz #3
Fall 2010 (Buckley)
1. (5 points) Consider each of the following systems to be initially at equilibrium. The
indicated stress is applied. State whether the equilibrium would shift to the left, to the
right, or not shift in response to the applied stress.
Shift?
Applied Stress
(Left, right, or none)
2 SO2 ( g )  O2 ( g )
2 SO3 ( g )
4 HBr ( g )  O2 ( g )
2 H 2O( )  2 Br2 ( )
N 2 ( g )  3H 2 ( g )
H 2CO3 (aq )
Reduce volume
H  426 kJ
2 NH 3 ( g )
Add catalyst
H 2O( )  CO2 ( g )
Ag  (aq)  2 NH 3 (aq)
Heat the vessel
Increase volume
Ag ( NH 3 ) 2  ( aq)
NaCl is added
2. (3 points) Write the formula for the conjugate acid of each of the following. Be sure to
include the charge if an ion is formed.
a. CH3NH2
________________
b. HCO3-
________________
c. H2O
________________
3. (3 points) An aqueous solution has a pH of 6.75. Find the pOH, [H+], and [OH-] for this
solution. Show your work.
4. (7 points) Find the pH, pOH, [H+], and [OH-] for a 0.170 M solution of HCN. The Ka
for HCN is 4.9 × 10-10. Show your work.
5. (7 points) Find the pH, pOH, [H+], and [OH-] for a 0.35 M solution of C5H5N. The Kb
for C5H5N is 1.7 × 10-9. Show your work.