Why are Limestone structures eroded by acid rain?

CO2 present in the air can dissolve in rain water producing carbonic acid. This acid is weak but can give rain water a slightly acidic pH of around 5.6

When this rain water falls it reacts with the claim carbonate present in limestone, in the following reaction:

Calcium carbonate + carbonic acid -> Calcium Salt + Water + CO2

This reaction has been responsible for the natural formation of limestone caves over millions of years, but more recently more acidic rain has been produce by the excess Sulfur Dioxide produced by burning Coal. SO2 reacts with water in the atmosphere to produce Sulphuric acid (H2SO4). This acid is stronger than carbonic acid and can give water a pH of below 5. When this falls as acid rain it produces a strong reaction with calcium carbonate which may erode statues and buildings, and cause damage to environmental features such as crops and trees.

Answered by Greg L. Chemistry tutor

14051 Views

See similar Chemistry GCSE tutors

Related Chemistry GCSE answers

All answers ▸

What is a catalyst?


How would you preform the flame test to identify the presence of Sodium in a solution? (3Marks)


Describe what happens to sodium and chlorine in a reaction to make Sodium cholride, you may use diagrams to help you.


Why do ionic compounds conduct electricity when molten or in solution, but not when solid?


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2024

Terms & Conditions|Privacy Policy
Cookie Preferences