Here's why:
* Chemical Reaction: Calcium carbonate reacts with acids, like sulfuric acid (H2SO4) and nitric acid (HNO3) present in acid rain, to neutralize them. The reaction produces calcium sulfate (CaSO4), calcium nitrate (Ca(NO3)2), water (H2O), and carbon dioxide (CO2). This reaction effectively reduces the acidity of the rainwater.
* Abundance: Limestone and marble are abundant and readily available. This makes calcium carbonate a practical and cost-effective solution for neutralizing acid rain.
* Other applications: Calcium carbonate has numerous applications, including in construction, agriculture, and the food industry. This makes its use in neutralizing acid rain a sustainable and versatile approach.
Important Note: While calcium carbonate is effective, it's not a complete solution. Other factors like the severity of acid rain, the type of soil, and the overall environment need to be considered for successful acid rain mitigation.
Other minerals like dolomite (CaMg(CO3)2) also contribute to neutralizing acid rain due to their similar chemical reactions. However, calcium carbonate remains the most commonly used and effective mineral for this purpose.
