Write theh chemical reaction associated with the ''brown ring test''

Explanation

### Step-by-Step Solution:

1. **Understanding the Brown Ring Test**: The brown ring test is a qualitative analysis method used to confirm the presence of nitrate ions (NO3-) in a solution.

2. **Initial Reaction**: The test begins with the addition of concentrated sulfuric acid (H2SO4) to sodium nitrate (NaNO3). This reaction produces sodium bisulfate (NaHSO4) and nitric acid (HNO3).
\[ \text{NaNO}_3 + \text{H}_2\text{SO}_4 \rightarrow \text{NaHSO}_4 + \text{HNO}_3 \]
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