Multiple Choice
Which of the following equations correctly represents the relationship between pH and hydronium ion concentration [H3O+]?
17. Acid and Base Equilibrium
The pH Scale
Struggling with General Chemistry?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Which statement best describes the pH scale?
A
The pH scale ranges from 0 to 20.
B
A pH of 7 indicates a highly acidic solution.
C
The pH scale measures the concentration of hydrogen ions in a solution.
D
The pH scale is used to measure the temperature of a solution.
Verified step by step guidance1
Understand that the pH scale is a measure of the acidity or basicity of a solution, which is determined by the concentration of hydrogen ions (H⁺) in the solution.
Recognize that the pH scale typically ranges from 0 to 14, not 0 to 20. A pH of 7 is considered neutral, which is the pH of pure water at 25°C.
Identify that a pH less than 7 indicates an acidic solution, where there is a higher concentration of hydrogen ions. Conversely, a pH greater than 7 indicates a basic (or alkaline) solution, where there is a lower concentration of hydrogen ions.
Note that the statement 'A pH of 7 indicates a highly acidic solution' is incorrect because a pH of 7 is neutral, not acidic.
Clarify that the pH scale does not measure the temperature of a solution; it specifically measures the concentration of hydrogen ions, which determines the solution's acidity or basicity.
Related Videos
Related Practice
