Which of the following statements about the equilibrium constant ...

[dbose]

Which of the following statements about the equilibrium constant of an acid is true?
 
  a. The equilibrium constant of a weak acid is large.
  b. The equilibrium constant of a strong acid is small.
  c. The equilibrium constant of a weak acid is small.
  d. The more an acid ionizes, the smaller is the equilibrium constant.

Question 2

What are the major mechanisms responsible for maintaining a stable pH despite massive CO2 production? 1. Isohydric buffering 2. Gastrointestinal secretion 3. Pulmonary ventilation
 
  a. 2 and 3 only
  b. 1 and 2 only
  c. 1, 2, and 3
  d. 1 and 3 only

[kiamars2010]

Answer to Question 1

ANS: C
The KA is small because the H2CO3 concentration is quite large with respect to the numerator of reaction (3). The value of KA is always the same for H2CO3 at equilibrium, regardless of the ini-tial concentration of H2CO3. A strong acid, such as HCl, has a large KA because the denominator HCl is extremely small, compared with the numerator (H+  Cl).

Answer to Question 2

ANS: D
Isohydric buffering and ventilation are the two major mechanisms responsible for maintaining a stable pH in the face of massive CO2 production.

[dbose]

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