Acids have a corrosive effect on limestone or marble buildings or sculptures. It is well established that either wet or dry deposition of sulfur dioxide significantly increases the rate of corrosion on limestone, sandstone, and marble. sulfur dioxide plus water makes sulfurous acid SO2 + H2O –> H2SO3 sulfur trioxide plus water makes sulfuric acid SO3 + H2O –> H2SO4 The sulfuric acid then further reacts with the limestone in a neutralization reaction. Limestone: CaCO3 + H2SO4 –> CaSO4 + H2CO3 H2CO3 –> CO2 gas + H2O The calcium sulfate is soluble in water and hence the limestone dissolves and crumbles. There are many examples in both the U. S. and Europe of the corrosive effects of acid rain on sculptures. Many sculptures have been destroyed, a few have been preserved by bringing them inside. The above reactions can be simulated in a demonstration by putting an egg in vinegar. The eggshell is made from the same material as limestone – calcium carbonate. The acetic acid produces an im