The pH scale is used to measure acidity The pH of a substanc

The pH scale is used to measure acidity. The pH of a substance is defined as pH = -log[H^+]. Where H^+ is the concentration of the Hydrogen Ion. The more concentrated it is, the more acidic the substance is. A pH of 7 is neutral, while a pH of 0 is extremely acidic. The PH of lemon juice is about 2.0, while a tomato juice is about 4.5 on the pH scale. How much more acidic (as in how much greater is the concentration of the Hydrogen Ion) is lemon juice than tomato juice?

Solution

lemon juice : pH = - log[H+] = 2.0

tomato juice : pH = -log[H+] =4.5

lemon juice :log[H+] = 10^-2 = 0.01

tomato juice : log[H+] = 10^-4.5 =0.0000316

lemon juice/tomato juice = 0.01/0.0000316 = 316.45 time more acidic