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
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What does the pH scale measure in an aqueous solution?
A
The mass percent of acid present in the solution
B
The electrical conductivity of the solution
C
The concentration of hydroxide ions, expressed as
D
The concentration of hydrogen ions, expressed as
Verified step by step guidance1
Understand that the pH scale is a measure used to indicate 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.
The mathematical expression for pH is given by the negative logarithm (base 10) of the hydrogen ion concentration: \(\mathrm{pH} = -\log\left[\mathrm{H}^+\right]\).
Recognize that a lower pH value corresponds to a higher concentration of hydrogen ions (more acidic), while a higher pH corresponds to a lower concentration of hydrogen ions (more basic).
Note that the pH scale does not measure mass percent of acid, electrical conductivity, or hydroxide ion concentration directly, but specifically the hydrogen ion concentration.
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