1. The Range:
* The pH scale ranges from 0 to 14.
* A pH of 7 is neutral, meaning the solution is neither acidic nor alkaline.
* Solutions with a pH below 7 are acidic, with lower numbers indicating stronger acidity.
* Solutions with a pH above 7 are alkaline (basic), with higher numbers indicating stronger alkalinity.
2. The Logarithmic Nature:
* The pH scale is logarithmic, meaning each whole number change in pH represents a tenfold change in hydrogen ion concentration ([H+]).
* For example, a solution with a pH of 5 has ten times the hydrogen ion concentration of a solution with a pH of 6.
3. The Formula:
* The pH of a solution is calculated using the following formula:
pH = -log[H+]
Where:
* pH is the pH of the solution
* [H+] is the hydrogen ion concentration in moles per liter (mol/L).
In summary:
* The pH scale is a convenient way to express the acidity or alkalinity of a solution.
* A lower pH indicates higher acidity, a higher pH indicates higher alkalinity, and a pH of 7 is neutral.
* The scale is logarithmic, so a change of one pH unit represents a tenfold change in hydrogen ion concentration.
Example:
* A solution with a pH of 3 is 100 times more acidic than a solution with a pH of 5.
* pH 3: [H+] = 10^-3 mol/L
* pH 5: [H+] = 10^-5 mol/L
