Calcium Carbonate Marble Acid Rain

When sulfurous sulfuric and nitric acids in polluted air and rain react with the calcite in marble and limestone the calcite dissolves.

Calcium carbonate marble acid rain.

In exposed areas of buildings and statues we see roughened surfaces removal of material and loss of carved details. This produces a solution of bicarbonate. It is well established that either wet or dry deposition of sulfur dioxide significantly increases the rate of corrosion on limestone sandstone and marble. Calcium carbonate is a chemical compound with the formula ca co 3 it is a common substance found in rocks as the minerals calcite and aragonite most notably as limestone which is a type of sedimentary rock consisting mainly of calcite and is the main component of pearls and the shells of marine organisms snails and eggs calcium carbonate is the active ingredient in agricultural lime and.

Nevertheless the acids contained in the acid rain are capable to transform caco 3 by chemical reactions into soluble salts which are washed away giving rise to the formation of holes on the surface of the artifacts due to loss of material. A chemical reaction equation 9 between calcium carbonate and sulfuric acid the primary acid component of acid rain results in the dissolution of caco. Calcium sulphate water carbon dioxide gas. Limestone is one familiar form of calcium carbonate.

Although these are recognized as highly durable materials buildings and outdoor monuments made of marble and limestone are now being gradually eroded away by acid rain. Acid rain effects on buildings acids have a corrosive effect on limestone or marble buildings or sculptures. Acids in acid rain promote the dissolution of calcium carbonate by reacting with the carbonate anion. Acid precipitation affects stone primarily in two ways.

How does this happen. Because surface waters are in equilibrium with atmospheric carbon dioxide there is a constant concentration of carbonic acid h 2 co 3 in the water. When sulfurous sulfuric and nitric acids in polluted air react with the calcite in marble and limestone the calcite dissolves. Acid rain has the following reaction with the marble calcium carbonate.

Calcium carbonate chemically reacts with acids the main acid in acid rain is sulphuric acid formed from sulphur dioxide emissions to form a salt e g. Stone surface material may be lost all over or only in spots that are more reactive.