Multiple Choice
At 60 °C, the value of KW is 1.3×10⁻¹³. What is the concentration of H₃O⁺ in a neutral solution at 60 °C?
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17. Acid and Base Equilibrium
Auto-Ionization
Multiple Choice
Pure water can ionize into which of the following?
A
H+ and Cl-
B
H3O+ and OH-
C
H2 and O2
D
H+ and O2-
Verified step by step guidance1
Understand that pure water undergoes a process called autoionization or self-ionization, where water molecules react with each other to form ions.
Recall the chemical equation for the autoionization of water: \(2\,\mathrm{H_2O} \rightleftharpoons \mathrm{H_3O^+} + \mathrm{OH^-}\), where one water molecule donates a proton to another, producing hydronium (\(\mathrm{H_3O^+}\)) and hydroxide (\(\mathrm{OH^-}\)) ions.
Recognize that ions like \(\mathrm{H^+}\) and \(\mathrm{Cl^-}\) or \(\mathrm{H^+}\) and \(\mathrm{O^{2-}}\) do not result from pure water ionization because chloride and oxide ions are not present in pure water.
Note that \(\mathrm{H_2}\) and \(\mathrm{O_2}\) are gases produced by water electrolysis, not by its ionization.
Conclude that the correct ion pair formed by pure water ionization is \(\mathrm{H_3O^+}\) and \(\mathrm{OH^-}\).
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