![]() ![]() More ammonium (NH4) can be formed when some of the acids are partially neutralized by airborne ammonia (NH3). ![]() Catalysts such as hydrogen peroxide, ozone and ammonium help promote the formation of acids in clouds. The acids usually dissolve in cloud droplets and may travel great distances before being precipitated as acid rain. Sulphuric acid (H2 SO4) and the nitrogen oxides will become nitric acid (HNO3). If they are in the atmosphere for any time, the gases will oxidize (gain an oxygen atom) and go into solution as acids. The gases may be dry deposited–absorbed directly by the land, by lakes or by the surface vegetation. Most sulphur leaves factory chimneys as the gaseous sulphur dioxide (SO2) and most nitrogen is also emitted as one of the nitrogen oxides (NO or NO2), both of which are gases. When they burn, they make sulphur dioxide (SO2). Acid rain comes from sulphur in coal and oil. ![]()
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