When `SO_2` gas is passed into aqueous `Na_2CO_3` , the product (s) formed is (are)

Options

A. `NaHSO_4`
B. `Na_2SO_2`
C. `NaHSO_3`
D. `Na_2SO_3 and NaHSO_3`

Answer

To solve the problem of what products are formed when \( SO_2 \) gas is passed into aqueous \( Na_2CO_3 \), we can follow these steps:

### Step-by-step Solution:

1. **Identify the Reactants**:
We have sulfur dioxide gas (\( SO_2 \)) and sodium carbonate (\( Na_2CO_3 \)) in aqueous solution.

2. **Understand the Reaction**:
When \( SO_2 \) is introduced to \( Na_2CO_3 \), it reacts with the carbonate ion (\( CO_3^{2-} \)). The \( SO_2 \) can displace the carbonate ion and lead to the formation of sodium bisulfite (\( NaHSO_3 \)) and carbon dioxide (\( CO_2 \)).

3. **Write the Reaction**:
The balanced chemical reaction can be represented as:
\[ Na_2CO_3 + SO_2 \rightarrow NaHSO_3 + CO_2 \]

4. **Formation of Products**:
The sodium bisulfite (\( NaHSO_3 \)) can further decompose into sodium sulfite (\( Na_2SO_3 \)) in the presence of water:
\[ 2 NaHSO_3 \rightarrow Na_2SO_3 + H_2O + SO_2 \]

5. **Final Products**:
Therefore, the products formed from the reaction of \( SO_2 \) with \( Na_2CO_3 \) are:
- Sodium bisulfite (\( NaHSO_3 \))
- Sodium sulfite (\( Na_2SO_3 \))
- Carbon dioxide (\( CO_2 \))

### Conclusion:
The products formed when \( SO_2 \) gas is passed into aqueous \( Na_2CO_3 \) are \( NaHSO_3 \) and \( Na_2SO_3 \) along with \( CO_2 \).