Multiple Choice
On the pH scale, healthy human skin and hair are typically considered slightly acidic. Which pH range best matches this condition?
34
views
17. Acid and Base Equilibrium
The pH Scale
Multiple Choice
On the pH scale, pH is a measurement of the concentration of what species in aqueous solution?
A
Hydrogen ions, (equivalently, hydronium ions, )
B
Electrons,
C
Hydroxide ions,
D
Sodium 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\+), which are also often represented as hydronium ions (H\_3O\+), since in water, hydrogen ions associate with water molecules.
Recognize that the formula for pH is given by \(\mathrm{pH} = -\log[\mathrm{H}^\+ ]\), where \([\mathrm{H}^\+]\) is the molar concentration of hydrogen ions in the solution.
Note that other species such as electrons (e\-), hydroxide ions (OH\-), or sodium ions (Na\+) are not directly measured by the pH scale.
Therefore, the pH scale specifically measures the concentration of hydrogen ions (H\+) or equivalently hydronium ions (H\_3O\+) in aqueous solution.
Related Videos
Related Practice
