Experiment 5: prelab EXPERIMENTS IN CHEMICAL EQUILIBRIUM, chem 206    (1.5 marks) Write the expression for the equilibrium constants for the following reactions: a. N2(g)...

Experiment 5: prelab EXPERIMENTS IN CHEMICAL
EQUILIBRIUM, chem 206
 
 (1.5 marks) Write the expression for the equilibrium constants for the following
reactions:
a. N2(g) + 3H2(g) 2NH3(g)
b. 2SO
2(g) + O2(g) 2SO3(g)
c. NH
3(g) + HCl(g) NH4Cl(s)
 
 
 
(3 marks – 1 here, 2 on next page) For reaction 2(a) above, suppose equilibrium has been
established. Explain how and why the position of equilibrium will shift in response to the
following changes:
a. Additional nitrogen is added to the system.
b. Ammonia is removed from the system as it forms.
c. The pressure on the system is increased.
 
 
 
 
(1.5 marks) A 1.00 mL sample of dilute acetic acid required 23.4 mL of 0.10 M sodium
hydroxide solution to titrate the sample to a phenolphthalein endpoint (which is assumed
to be close in pH to the equivalence point). What was the concentration of acetic acid in
the sample (show your work)? How many significant figures are justified in your
answer? Why?