Give equations for the following:
Preparation of CO2 from CaCo3 ​

Explanation

To prepare carbon dioxide (CO2) from calcium carbonate (CaCO3), we can use the following chemical reaction:

### Step-by-Step Solution:

1. **Identify the Reactants**: The main reactant is calcium carbonate (CaCO3). To produce CO2, we will react it with an acid, commonly hydrochloric acid (HCl).

2. **Write the Reaction**: When calcium carbonate reacts with hydrochloric acid, it produces calcium chloride (CaCl2), carbon dioxide (CO2), and water (H2O). The unbalanced equation can be written as:
\[ \text{CaCO}_3 + \text{HCl} \rightarrow \text{CaCl}_2 + \text{CO}_2 + \text{H}_2\text{O} \]

3. **Balance the Equation**: To balance the equation, we need to ensure that the number of atoms of each element is the same on both sides. The balanced equation is:
\[ \text{CaCO}_3 + 2 \text{HCl} \rightarrow \text{CaCl}_2 + \text{CO}_2 + \text{H}_2\text{O} \]

### Final Balanced Equation:
\[ \text{CaCO}_3 + 2 \text{HCl} \rightarrow \text{CaCl}_2 + \text{CO}_2 + \text{H}_2\text{O} \]