Multiple Choice
On the pH scale at , what is the pH of a neutral 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 ions in aqueous solution?
A
Chloride ions,
B
Hydronium ions,
C
Sodium ions,
D
Hydroxide ions,
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\(\textsubscript{3}\)O\(\textsuperscript{+}\)), also known as hydronium ions, in the solution.
Recognize that the formula for pH is given by \(\mathrm{pH} = -\log_{10}[\mathrm{H}_3\mathrm{O}^+]\), where \([\mathrm{H}_3\mathrm{O}^+]\) is the molar concentration of hydronium ions.
Note that chloride ions (Cl\(\textsuperscript{−}\)), sodium ions (Na\(\textsuperscript{+}\)), and hydroxide ions (OH\(\textsuperscript{−}\)) are not directly measured by the pH scale, although hydroxide ions relate to pOH, which is complementary to pH.
Conclude that the pH scale specifically measures the concentration of hydronium ions (H\(\textsubscript{3}\)O\(\textsuperscript{+}\)) in aqueous solution.
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