Rain is already slightly acidic originally and has a pH of 6 without being introduced to acids in our atmosphere.This is because as rain falls it combines with carbon dioxide CO2 to form carbonic acid H2CO3 which is a very weak acid and completely harmless in our environment. When acids are introduced into the rainwater it can lower the pH of rain to 3, this is very acidic according to the pH scale. The lowering of pH is 10-fold. This means that lowering the pH from 6 to 3 you must do 10x10x10 to get the correct number of times the pH is lowered. A pH difference from 6 to 3 is a 1000 times different which is a huge difference. How exactly does acid rain affect our environment though? If acid rain falls on limestone soil then it would most likely
