What are the reactions involved in removing `SO_2` from the atmosphere by passing it through a solution containing citrate ions ?

Explanation

To understand the reactions involved in removing \( SO_2 \) from the atmosphere by passing it through a solution containing citrate ions, we can break down the process into a series of steps:

### Step 1: Reaction of \( SO_2 \) with Water
The first step in the removal process involves the reaction of sulfur dioxide (\( SO_2 \)) with water (\( H_2O \)). This reaction produces bisulfite ions (\( HSO_3^- \)):

\[ SO_2 + H_2O \rightarrow HSO_3^- + H^+ \]
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