Multiple Choice
Alkaline (basic) solutions have a pH in which of the following ranges at ?
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17. Acid and Base Equilibrium
The pH Scale
Multiple Choice
In aqueous solution, the pH of a substance is a measure of its:
A
total concentration of dissolved ions (ionic strength)
B
hydroxide ion concentration,
C
hydrogen ion concentration,
D
temperature of the solution
Verified step by step guidance1
Understand that pH is a measure used to express the acidity or basicity of an aqueous solution.
Recall the definition of pH, which is given by the formula: \(\mathrm{pH} = -\log\left([\mathrm{H}^+ ]\right)\), where \([\mathrm{H}^+]\) is the concentration of hydrogen ions in the solution.
Recognize that pH specifically relates to the hydrogen ion concentration, not the hydroxide ion concentration or the total ionic strength of the solution.
Note that while hydroxide ion concentration \([\mathrm{OH}^-]\) is related to pH through the water dissociation equilibrium, pH itself is directly defined by the hydrogen ion concentration.
Conclude that the correct interpretation of pH is the negative logarithm of the hydrogen ion concentration, which quantifies how acidic or basic the solution is.
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