Multiple Choice
On the pH scale, what is the typical (normal) pH range of healthy human skin?
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17. Acid and Base Equilibrium
The pH Scale
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On the pH scale, what do we call a solution with a pH of at ?
A
Neutral
B
Acidic
C
Basic (alkaline)
D
A strong acid
Verified step by step guidance1
Understand that the pH scale measures the acidity or basicity of a solution, ranging typically from 0 to 14 at 25\degree C.
Recall that a pH of 7 at 25\degree C corresponds to a neutral solution, meaning the concentration of hydrogen ions \( \left[ \mathrm{H}^+ \right] \) equals the concentration of hydroxide ions \( \left[ \mathrm{OH}^- \right] \).
Recognize that solutions with pH less than 7 are acidic (higher \( \left[ \mathrm{H}^+ \right] \) than \( \left[ \mathrm{OH}^- \right] \)) and those with pH greater than 7 are basic or alkaline (higher \( \left[ \mathrm{OH}^- \right] \) than \( \left[ \mathrm{H}^+ \right] \)).
Note that the temperature of 25\degree C is important because the neutral pH value can shift slightly with temperature changes due to the autoionization of water.
Therefore, a solution with pH exactly 7 at 25\degree C is called neutral.
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