18.   How many chemical reactions are possible regarding the formation of carbonic acid and the dissolving of calcite? 

A. 23
B. 10
C. 2
D. 3

I am stuck on this I looked in my text book and it shows the words but not the number answers!

I think it might be D.3?

It was 3 I found the answer☺

Discribe the formation of carbonic acid

To determine the number of chemical reactions possible regarding the formation of carbonic acid and the dissolving of calcite, you would need to understand the chemical equations involved in these processes.

Carbonic acid (H2CO3) is formed when carbon dioxide (CO2) dissolves in water (H2O). The chemical equation for this reaction is:

CO2 + H2O → H2CO3

Calcite (CaCO3) is a mineral that dissolves in the presence of acids, including carbonic acid. The dissolution of calcite can be represented by the following equation:

CaCO3 + H2CO3 → Ca2+ + 2HCO3-

Based on these chemical equations, we can see that there are two distinct reactions involved: the formation of carbonic acid when carbon dioxide dissolves in water, and the dissolution of calcite in the presence of carbonic acid.

Therefore, the correct answer to the question is C.2