Multiple Choice
Which of the following best describes a strong electrolyte in an aqueous solution?
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14. Solutions
Types of Aqueous Solutions
Multiple Choice
Which of the following best represents the composition of an aqueous solution of a strong acid and a strong base?
A
The solution contains undissociated molecules of the acid and base, with few ions.
B
Only H_2O molecules are present, with no ions.
C
The solution contains H_3O^+ and OH^- ions in equal concentrations, along with H_2O molecules.
D
The solution contains only H_3O^+ ions and H_2O molecules.
Verified step by step guidance1
Recall that strong acids and strong bases completely dissociate in aqueous solution, meaning they break apart fully into their ions.
Understand that when a strong acid (like HCl) dissolves in water, it donates protons (H^+) to water molecules, forming hydronium ions (H_3O^+).
Similarly, a strong base (like NaOH) dissociates completely to produce hydroxide ions (OH^-) in solution.
When equal amounts of a strong acid and a strong base are mixed, the H_3O^+ ions from the acid and the OH^- ions from the base neutralize each other, but both ions are still present in equal concentrations at equilibrium in the solution.
Therefore, the solution contains hydronium ions (H_3O^+), hydroxide ions (OH^-), and water molecules (H_2O), reflecting a neutralized but ion-containing aqueous solution.
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