Multiple Choice
On the pH scale, what quantity is measured for an aqueous solution?
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17. Acid and Base Equilibrium
The pH Scale
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The pH scale is a logarithmic measure of which ion concentration in aqueous solution?
A
Sodium ion concentration,
B
Hydronium ion concentration, (often written equivalently as )
C
Hydroxide ion concentration,
D
Electron concentration,
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 hydronium ions, which are represented as \(\left[\mathrm{H_3O^+}\right]\) or equivalently as \(\left[\mathrm{H^+}\right]\).
Recognize that the formula for pH is given by \(\mathrm{pH} = -\log_{10} \left[\mathrm{H_3O^+}\right]\).
Note that sodium ion concentration \(\left[\mathrm{Na^+}\right]\), hydroxide ion concentration \(\left[\mathrm{OH^-}\right]\), and electron concentration \(\left[\mathrm{e^-}\right]\) are not used in the calculation of pH.
Conclude that the pH scale specifically measures the hydronium ion concentration in aqueous solutions.
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