Worksheet: Combining Acid and Base Equilibria

In this worksheet, we will practice using suitable approximations to calculate the concentrations of species in multiple interacting equilibria.

Q1:

Hydrogen telluride (HTe)2 is a diprotic acid with 𝐾=2.3×10a1 and 𝐾=1.3×10a2.

What is 𝐾b for the reaction in which HTe functions as a base in water?

  • A 7 . 7 × 1 0
  • B 1 . 3 × 1 0
  • C 2 . 3 × 1 0
  • D 4 . 0 × 1 0
  • E 4 . 3 × 1 0

Q2:

An aqueous solution has an initial NH3 concentration of 0.115 M and an initial CHNH652 concentration of 0.100 M. The 𝐾b of NH3 is 1.8×10, the 𝐾b of CHNH652 is 4.6×10, and the self-ionization of water, 𝐾w, is 1.0×10. Calculate to 2 significant figures the concentration of CHNH653+ at equilibrium.

  • A0.14 M
  • B 3 . 2 × 1 0 M
  • C 6 . 9 × 1 0 M
  • D0.10 M
  • E 1 . 4 × 1 0 M

Q3:

A solution has an initial HNO2 concentration of 0.134 M and an initial HBrO concentration of 0.120 M. The 𝐾a of HNO2 is 4.50×10 and the 𝐾a of HBrO is 2.00×10. Calculate the equilibrium concentration of BrO in the solution at equilibrium.

  • A 3 . 6 5 × 1 0 M
  • B 3 . 0 9 × 1 0 M
  • C 3 . 7 6 × 1 0 M
  • D 3 . 1 8 × 1 0 M
  • E 3 . 5 5 × 1 0 M

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