Question

in water gas shift reaction, carbon dioxide is removed by scrubbing with sodium arsenite solution. why is the term Scrubbing used?

Answer 1

As the contaminant present in the products produced by water gas shift reaction are removed by a process called scrubbing, the term Scrubbing is used.

Explanation:

• When carbon monoxide reacts with water, it leads to the formation of carbon dioxide along with hydrogen gas and this reaction is termed as water gas shift reaction.

• Chemically it is denoted as $CO+H_2O\rightarrow CO_2+H_2$

• As the products obtained are gases and they contain certain contaminants, in order to purify the product, a method called scrubbing is used.
• It is a unique process used for removing the contaminant present in the gases.
• In the gas scrubbing process, the impurities present in carbon dioxide (gas) are removed by using sodium arsenite solution (liquid).
• As this phenomenon is involved, the term "Scrubbing" is used in water gas shift reaction.

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