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.

  • A 2 . 0 × 1 0 M
  • B 5 . 0 × 1 0 M
  • C 1 . 0 × 1 0 M
  • D 2 . 0 × 1 0 M
  • E 2 . 0 × 1 0 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.

  • A 0.001 M
  • B 1 . 0 × 1 0 M
  • C 1 . 0 × 1 0 M
  • D 1 . 0 × 1 0 M
  • E 1 . 0 × 1 0 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?

  • A 7 . 2 × 1 0 M
  • B 3 . 1 × 1 0 M
  • C 3 . 2 × 1 0 M
  • D 9 . 0 × 1 0 M
  • E 1 . 0 × 1 0 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?

  • A 5 . 0 × 1 0 M
  • B 9 . 1 × 1 0 M
  • C 4 . 3 × 1 0 M
  • D 2 . 3 × 1 0 M
  • E 1 . 8 × 1 0 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?

  • A 5 . 0 × 1 0 M
  • B 9 . 3 × 1 0 M
  • C 2 . 2 × 1 0 M
  • D 4 . 5 × 1 0 M
  • E 2 . 0 × 1 0 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?

  • A 1 . 0 × 1 0 M
  • B 1 . 0 × 1 0 M
  • C 5 . 0 × 1 0 M
  • D 1 . 0 × 1 0 M
  • E 5 . 0 × 1 0 M

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