It's because there is already natural CO2 in the rain water (from the atmosphere), and CO2 is an acidic gas.
In today's world, there is no such thing as unpolluted water. We have successfully polluted the atmosphere and our earth. Our water is full of hydrocarbons, pharmaceuticals, and a plethora of other toxins/pollutants.
Rainwater naturally contains a small amount of carbonic acid.
Carbonic Acid.
Sulphuric acid Nitric acid Sulphurous acid Nitrous acid
It is butyric acid.
Nucleic acid
The IUPAC name for tartaric acid is 2,3-dihydroxybutanedioic acid.
The most common ore of aluminium is bauxite.
Sulphuric acid Nitric acid Sulphurous acid Nitrous acid
it means to bogino doshi desu
Gregg Rainwater's birth name is Rainwater, Gregg Andrew.
Keech Rainwater's birth name is Randy Keech Rainwater.
Jenny Rainwater's birth name is Jenny Elizabeth Rainwater.
Marvin Rainwater's birth name is Marvin Karlton Percy Rainwater.
citric acid
Formic acid
photasio
An acid found in grapes is called maleic acid
Acetic acid (IUPAC name: ethanoic acid), CH3COOH.
If sulphur dioxide and nitrogen dioxide are in the atmosphere and they mix with the water vapour then it falls as acid rain