The rock weathering process involving the equation; CaCO 3 + H 2 CO 3 → Ca(HCO 3 ) 2 is called

Correct Answer is : carbonation

Correct Answer is : carbonation

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WAEC Agriculture 2013 Paper

Question : 9

Total: 60

The rock weathering process involving the equation; CaCO₃ + H₂CO₃ → Ca(HCO₃)₂ is called

Solution:

Concept:

The reaction between carbonic acid and calcium carbonate in rocks is a chemical weathering process called carbonation.

Explanation:

Rainwater dissolves carbon dioxide from the air to form a weak carbonic acid,

\mathrm{H_2CO_3}

This acid reacts with calcium carbonate,

\mathrm{CaCO_3}

, present in rocks.

The product is soluble calcium bicarbonate,

\mathrm{Ca(HCO_3)_2}

, which gets removed in solution.

The chemical equation for this process is:

\mathrm{CaCO_3 + H_2CO_3 \rightarrow Ca(HCO_3)_2}

Because the key agent is carbonic acid, this process is known as carbonation.

Other options refer to different processes: hydration involves adding water, hydrolysis involves splitting by water, and oxidation involves oxygen.

Answer:

A. carbonation

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