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Lesson: Hydronium and Hydroxide Concentrations

Worksheet • 5 Questions

Q1:

The hydroxide ion concentration in household ammonia is 3 . 2 × 1 0 3 M at 2 5 C . What is the concentration of hydronium ions in the solution?

  • A 3 . 1 × 1 0 1 2 M
  • B 7 . 2 × 1 0 1 5 M
  • C 3 . 2 × 1 0 3 M
  • D 9 . 0 × 1 0 5 M
  • E 1 . 0 × 1 0 2 M

Q2:

A solution of carbon dioxide in water has a hydronium ion concentration of 2 . 0 × 1 0 6 M. What is the concentration of hydroxide ions at 2 5 C ? 𝐾 w at 2 5 C is 1 . 0 × 1 0 1 4 .

  • A 5 . 0 × 1 0 9 M
  • B 2 . 0 × 1 0 8 M
  • C 2 . 0 × 1 0 6 M
  • D 2 . 0 × 1 0 2 0 M
  • E 1 . 0 × 1 0 1 4 M

Q3:

The hydronium ion concentration in a sample of rainwater is found to be 2 . 3 × 1 0 M at 2 5 C . What is the concentration of hydroxide ions in the rainwater?

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

Q4:

What is the hydronium ion concentration in an aqueous solution with a hydroxide ion concentration of 0.001 M at 2 5 C ? 𝐾 w at 2 5 C is 1 . 0 × 1 0 1 4 .

  • A 1 . 0 × 1 0 1 1 M
  • B 1 . 0 × 1 0 1 1 M
  • C 1 . 0 × 1 0 1 4 M
  • D 1 . 0 × 1 0 1 7 M
  • E 0.001 M

Q5:

Lime juice has a pH of about 2.3. Given that the self-ionization constant of water, 𝐾 w , is 1 . 0 × 1 0 1 4 , what is the approximate hydroxide ion concentration of lime juice at 2 5 C ?

  • A 2 . 0 × 1 0 1 2 M
  • B 9 . 3 × 1 0 7 M
  • C 5 . 0 × 1 0 3 M
  • D 2 . 2 × 1 0 9 M
  • E 4 . 5 × 1 0 6 M
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