Having said that, self-ionization of water have to also be regarded when concentrations of a strong acid or base is very small or high. By way of example, a 5×10?8M Resolution of HCl could be predicted to possess a pH of 7.three dependant on the above mentioned technique, that's incorrect as it is actually acidic and must have a pH of lower than s

Precipitation- When precipitation falls from the air, it dissolves gases like carbon dioxide and kinds a weak acid.?Pure, unpolluted rain and snow is a bit acidic.?Precipitation commonly?contains a pH in between 5 and 6. Groundwater is water that exists underground in saturated zones beneath the land floor. The upper surface in the saturated zone