Multiple Choice
On the pH scale, what does pH measure in an aqueous solution?
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17. Acid and Base Equilibrium
The pH Scale
Multiple Choice
On the pH scale, pH is a measure of the concentration of which species in an aqueous solution?
A
Hydroxide ions,
B
Undissociated water molecules,
C
Electrons,
D
Hydrogen ions, (or hydronium, )
Verified step by step guidance1
Understand that the pH scale is a measure of the acidity or basicity of an aqueous solution.
Recall that pH is defined based on the concentration of hydrogen ions (H\(\textsuperscript{+}\)) in the solution.
Recognize that in water, hydrogen ions often exist as hydronium ions (H\(\textsubscript{3}\)O\(\textsuperscript{+}\)), which are simply hydrated protons.
Note that hydroxide ions (OH\(\textsuperscript{−}\)) indicate basicity, but pH specifically quantifies the concentration of hydrogen ions, not hydroxide ions.
Therefore, the pH scale measures the concentration of hydrogen ions (H\(\textsuperscript{+}\)) or hydronium ions (H\(\textsubscript{3}\)O\(\textsuperscript{+}\)) in an aqueous solution.
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