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Chapter 13 | Fundamental Equilibrium Concepts
29. 30.
Write the reaction quotient expression for the ionization of NH3 in water. What is the approximate value of the equilibrium constant KP for the change
at 25 °C. (Vapor pressure was described in the previous chapter on liquids and solids; refer back to this chapter to find the relevant information needed to solve this problem.)
13.3 Shifting Equilibria: Le Châtelier’s Principle
31. The following equation represents a reversible decomposition:
Under what conditions will decomposition in a closed container proceed to completion so that no CaCO3 remains?
32. Explain how to recognize the conditions under which changes in pressure would affect systems at equilibrium.
33. What property of a reaction can we use to predict the effect of a change in temperature on the value of an
equilibrium constant?
34. What would happen to the color of the solution in part (b) of Figure 13.8 if a small amount of NaOH were added and Fe(OH)3 precipitated? Explain your answer.
35. The following reaction occurs when a burner on a gas stove is lit:
Is an equilibrium among CH4, O2, CO2, and H2O established under these conditions? Explain your answer.
36. A necessary step in the manufacture of sulfuric acid is the formation of sulfur trioxide, SO3, from sulfur dioxide, SO2, and oxygen, O2, shown here. At high temperatures, the rate of formation of SO3 is higher, but the equilibrium amount (concentration or partial pressure) of SO3 is lower than it would be at lower temperatures.
(a) Does the equilibrium constant for the reaction increase, decrease, or remain about the same as the temperature
increases?
(b) Is the reaction endothermic or exothermic?
37. Suggest four ways in which the concentration of hydrazine, N2H4, could be increased in an equilibrium described by the following equation:
38. Suggest four ways in which the concentration of PH3 could be increased in an equilibrium described by the following equation:
39. How will an increase in temperature affect each of the following equilibria? How will a decrease in the volume
of the reaction vessel affect each? (a) (b)
(c)
(d)
40. How will an increase in temperature affect each of the following equilibria? How will a decrease in the volume of the reaction vessel affect each?
(a) (b) (c)
(d)
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