Why Does Acid Rain Cause Damage To Marble Statues

In exposed areas of buildings and statues we see roughened surfaces removal of material and loss of carved stone surface material may be lost all over or only in spots that are more reactive.

Why does acid rain cause damage to marble statues.

When an acid comes into contact with these materials it causes an exothermic reaction the dissolves the. In exposed areas of buildings and statues we see roughened surfaces removal of material and loss of carved details. Those acids are made by dissolving the components in water which are from oxidation of the gases such as so no and co. And nitric acids in polluted air react with the calcite in marble and limestone the calcite dissolves.

That s why acid rain dissolves statues made of marble. Architects chose limestone marble steel and brass as durable materials intended to resist the elements. The carbonic acid further breaks down into water and carbon dioxide. The marble has caco as the major component.

Stone surface material may be lost all over or only in spots that are more reactive. When sulfurous sulfuric and nitric acids in polluted air and rain react with the calcite in marble and limestone the calcite dissolves. Acid deposition can be caused by natural sources such as volcanoes but it is mainly caused by the release of sulfur dioxide and nitrogen oxide during fossil fuel combustion when these gases are discharged into the atmosphere they react with the water oxygen and other gases already present there to form sulfuric acid ammonium nitrate and nitric acid. When sulfuric acid rain strikes these statues the reaction of the sulfuric acid with the calcium carbonate yields calcium sulfate and carbonic acid.

A lot of buildings and statues are made of basic alkaline materials such as limestone. What causes acid rain.