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 Γ— 1 0 βˆ’ 6 M. What is the concentration of hydroxide ions at 2 5 ∘ C ? 𝐾 w at 2 5 ∘ C is 1 . 0 Γ— 1 0 βˆ’ 1 4 .

  • A 1 . 0 Γ— 1 0 βˆ’ 1 4 M
  • B 2 . 0 Γ— 1 0 βˆ’ 6 M
  • C 2 . 0 Γ— 1 0 βˆ’ 2 0 M
  • D 5 . 0 Γ— 1 0 βˆ’ 9 M
  • E 2 . 0 Γ— 1 0 8 M

Q2:

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 Γ— 1 0 βˆ’ 1 4 .

  • A 0.001 M
  • B 1 . 0 Γ— 1 0 βˆ’ 1 4 M
  • C 1 . 0 Γ— 1 0 βˆ’ 1 7 M
  • D 1 . 0 Γ— 1 0 βˆ’ 1 1 M
  • E 1 . 0 Γ— 1 0 1 1 M

Q3:

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

  • A 1 . 0 Γ— 1 0 βˆ’ 2 M
  • B 3 . 2 Γ— 1 0 βˆ’ 3 M
  • C 9 . 0 Γ— 1 0 βˆ’ 5 M
  • D 3 . 1 Γ— 1 0 βˆ’ 1 2 M
  • E 7 . 2 Γ— 1 0 βˆ’ 1 5 M

Q4:

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

  • A 5 . 0 Γ— 1 0   M
  • B 2 . 3 Γ— 1 0   M
  • C 9 . 1 Γ— 1 0   M
  • D 4 . 3 Γ— 1 0   M
  • E 1 . 8 Γ— 1 0    M

Q5:

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

  • A 4 . 5 Γ— 1 0 βˆ’ 6 M
  • B 5 . 0 Γ— 1 0 βˆ’ 3 M
  • C 2 . 2 Γ— 1 0 βˆ’ 9 M
  • D 2 . 0 Γ— 1 0 βˆ’ 1 2 M
  • E 9 . 3 Γ— 1 0 βˆ’ 7 M

Nagwa uses cookies to ensure you get the best experience on our website. Learn more about our Privacy Policy.