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?

  • A7.7×10
  • B1.3×10
  • C2.3×10
  • D4.0×10
  • E4.3×10

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
  • B3.2×10 M
  • C6.9×10 M
  • D0.10 M
  • E1.4×10 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.

  • A3.65×10 M
  • B3.09×10 M
  • C3.76×10 M
  • D3.18×10 M
  • E3.55×10 M

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