Understanding pH
* pH Scale: The pH scale measures the acidity or alkalinity of a solution. It ranges from 0 to 14.
* Hydrogen Ions: A lower pH indicates a higher concentration of hydrogen ions (H+), making the solution more acidic. A higher pH indicates a lower concentration of hydrogen ions, making the solution more alkaline (basic).
* Logarithmic Scale: The pH scale is logarithmic, meaning each whole number change in pH represents a tenfold change in hydrogen ion concentration.
Calculation
* pH 7: This is neutral (pure water).
* pH 4: This is acidic.
* Difference: The pH difference is 3 (7 - 4 = 3).
Since the pH scale is logarithmic, a difference of 3 pH units means the solution with a pH of 4 has 1000 times more hydrogen ions than the solution with a pH of 7.
In simpler terms:
* A solution with pH 4 is 1000 times more acidic than a solution with pH 7.
