Homework: Logarithms

The measure of acidity of a liquid is called the pH of the liquid. This is based on the amount of hydrogen ions (H+) in the liquid. The formula for pH is:

pH = −log[H+]

where [H+] is the concentration of hydrogen ions, given in a unit called mol/L (“moles per liter”).

Liquids with a low pH (down to 0) are more acidic and those with a high pH are more basic.