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Chemistry > Chemical Reactions and Equations > What is Chemical Weathering? – Definition, Process, Examples.
Chemical Reactions and Equations

What is Chemical Weathering? – Definition, Process, Examples.

What is Chemical Weathering?

Chemical weathering relates to the adjustments in rock structure under the activity or impact of synthetic reaction. There are many natural procedures and reaction inside the stones that change the organization and structure of the stones after some time.

Temperature and, particularly, dampness is basic for concoction enduring. Synthetic enduring, in this manner, happens all the more rapidly in hot, damp climatic locales.

At the point when downpour falls, the water is somewhat acidic on the grounds that carbon dioxide from the air breaks up in it. The stone may end up endured as a result of the minerals present in it that may respond with the water to frame new minerals (dirt) and solvent salts.

Chemical weathering happens in light of the fact that the procedures are progressive and continuous, subsequently changing the mineralogy of the stones after some time that makes them to erode, break down, or crumble. The stone’s compound changes are profoundly affected by the connection of water and oxygen through procedures, for example, hydrolysis and oxidation.

chemical weathering

Procedures of Chemical Weathering

Stormwater, corrosive downpour, bio-synthetic procedures and mountain developments or rock inspires are a portion of the procedures deciding compound enduring.


It assumes a significant job in the hydrolysis and oxidation forms inside the stones. Stormwater can turn into somewhat acidic by retaining carbon dioxide in the environment and all things considered this actuates concoction activity with the mineral granular particles in the stone creating substance mixes, for example, salts and minerals that break up or consumes the stones.

Acid Rain

Acid rain happens when water ends up corrosive by blending with acidic statements in the climate. The ignition of non-renewable energy sources, for example, coal, fuel, and gas discharge oxides of nitrogen, sulfur, and carbon into the air which reacts with dampness to shape water that is more acidic than ordinary.

The subsequent corrosive downpour at that point responds with the stone’s mineral particles to deliver new minerals and salts that can without much of a stretch break down or erode the stone grains.

Bio-Chemical Processes

Different plants and creatures can make concoction enduring by emanating acidic mixes. In that capacity, infinitesimal creatures, for example, greenery, lichens, microbes, and green growth can accelerate substance enduring particularly on the stone surfaces where they develop.

They discharge what we call acidifying molecules(natural acids and protons) and chelating mixes (siderophores and natural acids). These mixes have the capability of separating iron and aluminum minerals in the stones. Then water breaks these minerals, bringing about concoction enduring.

Mountain Movement or Rock Uplifts

The procedure of rock elevates or mountain developments open new shakes to the climatic conditions, for example, dampness and outrageous temperatures, permitting compound enduring to happen. For example, introduction of the stones to surface waters or precipitation quickens compound enduring by hydrolysis and acidic reaction that destroy calcium particles and different minerals.

Kinds of Chemical Weathering

The different kinds of chemical weathering emerge is driven by the progressive and continuous compound reaction. Also, mineralogy changes, the dissolving of the particles, and after that the last eroding or breaking down of the stones. These reactions incorporate hydrolysis, carbonation, disintegration, and oxidation. Temperature and in particular dampness are fundamental for substance enduring.


Hydrolysis is the compound reaction in which we add water to a substance. Water reactions with the stone and changes the size and substance creations of the minerals, diminishing their protection from enduring. At whatever point minerals are hydrolyzed, precious stone rocks and dirt minerals. For example, it creates calcium, potassium, and sodium particles.

This sort of Chemical weathering is exceptionally normal in molten rocks. The reaction takes either the type of hydration or lack of hydration. Retention of water into the stone relates to hydration while the expulsion of water from the stone relates to lack of hydration. Hydration extends the stone’s volume bringing about size adjustment.


Carbonation is the blending of water with carbon dioxide to make carbonic corrosive. It happens when the stone minerals respond with frail carbonic corrosive shaped when water consolidates with carbon dioxide in the air. Carbonic corrosive follows up on the stone by separating and dissolving its mineral substance.

The ground water washes away the disintegrate materials with it. And the solvent particles are put away in the groundwater supply. Rocks, for example, limestone and feldspar experience this sort of concoction enduring more. This sort of enduring is significant in the arrangement of caverns.


Disintegration similarly means filtering. It the procedure in stones break up when comes in contact with water. Limestone and rock salts are especially the stones that structure dissolvable arrangements when comes in contact with water, surface waters, or even ground water.

After dissolving, the minerals in the stones become particle arrangements in the water which are then washed away. Karst highlights are a typical case of this marvel.

Solved Question for You

Ques: Animals, plants and humans themselves are responsible for weathering of rocks and this process is known as

  1. biological weathering
  2. chemical weathering
  3. physical weathering
  4. mechanical weathering

Ans: The answer is A.

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