The scheme of transformations is given: CO2-X-Ca (HCO3) 2 Determine the unknown intermediate.

We have been given the task to produce two reactions. We need, by carrying out two reactions, to obtain from tetravalent carbon monoxide (carbon dioxide) to obtain calcium bicarbonate, and to find out the intermediate substance necessary for such a transformation.

The first reaction is the interaction of carbon dioxide with water. Carbonic acid is formed. It is thanks to the presence of carbonic acid that we will be able to carry out further reaction. It is carbonic acid that is an intermediate substance. Graphically, this equation of a chemical reaction can be expressed as follows:

CO2 + H2O = H2CO3

The second reaction is the interaction of carbonic acid, carbon dioxide and water. It is thanks to this chemical reaction that the substance calcium bicarbonate is formed. We write the reaction equation like this:

CaCO3 + CO2 + H2O = Ca (HCO3) 2.

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