Multiple Choice
On the pH scale at , which value is considered neutral?
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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 electrical conductivity of the solution
B
The concentration of hydroxide ions, , only
C
The total number of moles of solute dissolved per liter of solution (molarity)
D
The concentration of hydrogen ions, , which indicates how acidic or basic the solution is
Verified step by step guidance1
Understand that the pH scale is a measure used to determine 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.
Know the mathematical definition of pH: \(\mathrm{pH} = -\log_{10} [\mathrm{H}^+]\), where \([\mathrm{H}^+]\) is the molar concentration of hydrogen ions.
Recognize that a low pH value indicates a high concentration of hydrogen ions (acidic solution), while a high pH value indicates a low concentration of hydrogen ions (basic solution).
Conclude that the pH scale does not measure electrical conductivity, hydroxide ion concentration alone, or total solute molarity, but specifically the concentration of hydrogen ions in the solution.
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