Worksheet: Hydronium and Hydroxide Concentrations

In this worksheet, we will practice converting between hydronium and hydroxide ion concentrations, using the autoionization constant of water.

Q1:

A solution of carbon dioxide in water has a hydronium ion concentration of 2.0×10 M. What is the concentration of hydroxide ions at 25C? 𝐾w at 25C is 1.0×10.

  • A5.0×10 M
  • B2.0×10 M
  • C2.0×10 M
  • D1.0×10 M
  • E2.0×10 M

Q2:

What is the hydronium ion concentration in an aqueous solution with a hydroxide ion concentration of 0.001 M at 25C? 𝐾w at 25C is 1.0×10.

  • A0.001 M
  • B1.0×10 M
  • C1.0×10 M
  • D1.0×10 M
  • E1.0×10 M

Q3:

The hydroxide ion concentration in household ammonia is 3.2×10 M at 25C. What is the concentration of hydronium ions in the solution?

  • A1.0×10 M
  • B9.0×10 M
  • C3.1×10 M
  • D3.2×10 M
  • E7.2×10 M

Q4:

The hydronium ion concentration in a sample of rainwater is found to be 2.3×10 M at 25C. What is the concentration of hydroxide ions in the rainwater?

  • A4.3×10 M
  • B1.8×10 M
  • C5.0×10 M
  • D2.3×10 M
  • E9.1×10 M

Q5:

Lime juice has a pH of about 2.3. Given that the self-ionization constant of water, 𝐾w, is 1.0×10, what is the approximate hydroxide ion concentration of lime juice at 25C?

  • A2.2×10 M
  • B9.3×10 M
  • C5.0×10 M
  • D2.0×10 M
  • E4.5×10 M

Q6:

The self-ionization constant of water, 𝐾w, is 1.0×10 at 25C. What is the hydronium ion concentration in pure water at this temperature?

  • A1.0×10 M
  • B5.0×10 M
  • C1.0×10 M
  • D1.0×10 M
  • E5.0×10 M

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