The pH scale measures the strength of acids and bases. Its formula is pH= -log(H+) where H+ is the concentration of hydrogen ions. A substance with a lower pH is more acidic.
According to the U.S. Environmental Protection Agency normal rain water has a pH of approx. 5.6. Little Echo Pond in Franklin, New York is one of the most acidic lakes reported in the U.S. with a pH of 4.2. About how many times as acidic is the water in Little Echo Pond as normal rainwater?

Question

The pH scale measures the strength of acids and bases. Its formula is pH= -log(H+) where H+ is the concentration of hydrogen ions. A substance with a lower pH is more acidic.
According to the U.S. Environmental Protection Agency normal rain water has a pH of approx. 5.6. Little Echo Pond in Franklin, New York is one of the most acidic lakes reported in the U.S. with a pH of 4.2. About how many times as acidic is the water in Little Echo Pond as normal rainwater?