Pure water has a pH of 7.0. However, normal rain is slightly acidic because carbon dioxide (CO2) dissolves into it forming weak acid, giving the resulting mixture a pH of approximately 5.6 at typical atmospheric concentrations of CO2.

Carbonic

Explanation:

Rain water is slightly acidic with a pH of 5.6. This happens due to the rain water reacting to atmospheric Carbon dioxide in atmospheric concentrations.

H20+ CO2= H2CO3 (carbonic acid)

The Hydrogen ions in the H2CO3 ( weak Carbonic acid) makes the water acidic. This explains the reason why rain water is referred to as acidic water.

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explanation:

mechanics (greek   is that area of science concerned with the behaviour of physical bodies when subjected to forces or displacements, and the subsequent effects of the bodies on their environment. the scientific discipline has its origins in ancient greece with the writings of aristotle and archimedes[1][2][3] (see history of classical mechanics and timeline of classical mechanics). during the early modern period, scientists such as galileo, kepler, and newton laid the foundation for what is now known as classical mechanics. it is a branch of classical physics that deals with particles that are either at rest or are moving with velocities significantly less than the speed of light. it can also be defined as a branch of science which deals with the motion of and forces on objects. the field is yet less widely understood in terms of quantum theory.

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