A conjugate acid base pair is an acid base pair that differ only by a proton X

A conjugate acid base pair is an acid base pair that

This preview shows page 11 - 13 out of 136 pages.

32- A conjugate acid-base pair is an acid-base pair that differ only by aproton. X and Y differ by a proton. Z differs by two protons. A. X only B. Y only C. X and Y only D. X and Z only E. X, Y and Z CHEM162-2002 HOURLY EXAM II + ANSWERS CHAPTER 14 - ACID AND BASE EQUILIBRIA ACID AND BASE EQUILIBRIA CONCEPTS 6. HX is a weak acid with pKa = 6.0. Which of the following reactions would have a large value for its equilibrium constant? - - - O Reactions of strong bases with weak (or strong) acids, and reactions of strong acids with weak (or strong) bases, go virtually to completion, yielding a correspondingly large value for its equilibrium constant. 162 EXAMVl SPRING 2002 3 CHEM162-2002 HOURLY EXAM II + ANSWERS CHAPTER 14 - ACID AND BASE EQUILIBRIA ACID AND BASE EQUILIBRIA CONCEPTS
Image of page 11
15. H2PO4- + HS-H2S+HPO42-Which species are functioning as acids in this equation? In the forward direction, H2PO4-provides a proton to HS-. Therefore, H2PO4-is an acid. In the reverse direction, H2S provides a proton to HPO42-. Therefore, H2S is an acid. A. H2PO4-and HPO42-B. 2PO4-andH2S C. -and H2S D. H2S and HPO42-E. HS-and HPO42-CHEM162-2002 HOURLY EXAM II + ANSWERS H HS CHAPTER 14 - ACID AND BASE EQUILIBRIA ACID AND BASE EQUILIBRIA CONCEPTS 17. In which one of the following equations does the equilibrium constant equal Kbfor methyl amine, CH3NH2? Kbcan only be the reaction of a base with water to form the protonated base plus hydroxide ion. It is not the reaction of base with another base (which rules C out) or the reaction of a base with acid (which rules E out). Furthermore, the base must act as a base, i.e., it must accept a proton and provide OH-. This rules out A and D, where the base is acting as if it was an acid. 3 O O CHAPTER 14 - ACID AND BASE EQUILIBRIA ACID AND BASE EQUILIBRIA CONCEPTS
Image of page 12
Image of page 13

You've reached the end of your free preview.

Want to read all 136 pages?

  • Spring '08
  • siegal
  • pH, Acids, Lewis acid, Base Equilibria

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture