Difficulty: Medium
Average Score: 87%
Entry Exam
What is pH?
Correct answer
A
Rationale
The correct answer is 'A: The measure of concentration of H?óÔÇÜãÆO?ó?ü?? ions.' pH is a measure of the concentration of hydronium ions (H?óÔÇÜãÆO?ó?ü??) in a solution, indicating the acidity or alkalinity on a scale from 0 to 14. Values below 7 are acidic, 7 is neutral, and above 7 is alkaline/basic. Choice B is incorrect as pH specifically measures hydronium ions, not hydrogen atoms. Choice C refers to water (H?óÔÇÜÔÇÜO), which is not directly related to pH measurement.