To prepare nitrous acid ($HNO_2$) in situ, the commonly used reagents are sodium nitrite (NaNO$_2$) and hydrochloric acid (HCl). The reaction proceeds as follows:

1. NaNO$_2$ has a nitrite ion (NO$_2^-$), which, in the presence of a strong acid like HCl, forms nitrous acid.
2. The general reaction is:

$$
\text{NaNO}_2 + \text{HCl} \rightarrow \text{HNO}_2 + \text{NaCl}
$$

Thus, the correct answer is:

### Final Answer
**NaNO$_2$ / HCl**

Question

To prepare nitrous acid ($HNO_2$) in situ, the commonly used reagents are sodium nitrite (NaNO$_2$) and hydrochloric acid (HCl). The reaction proceeds as follows:

1. NaNO$_2$ has a nitrite ion (NO$_2^-$), which, in the presence of a strong acid like HCl, forms nitrous acid.
2. The general reaction is:

$$
   \text{NaNO}_2 + \text{HCl} \rightarrow \text{HNO}_2 + \text{NaCl}
   $$

Thus, the correct answer is:

### Final Answer
**NaNO$_2$ / HCl**

Knowee AI · Accepted Answer

To prepare nitrous acid ($HNO_2$) in situ, the commonly used reagents are sodium nitrite (NaNO$_2$) and hydrochloric acid (HCl). The reaction proceeds as follows:

1. NaNO$_2$ has a nitrite ion (NO$_2^-$), which, in the presence of a strong acid like HCl, forms nitrous acid.
2. The general reaction is:

$$
   \text{NaNO}_2 + \text{HCl} \rightarrow \text{HNO}_2 + \text{NaCl}
   $$

Thus, the correct answer is:

### Final Answer
**NaNO$_2$ / HCl**

Which reagents are used to prepare nitrous acid in situ?Select answer from the options belowNaNO2 / HClHNO3 / H2ONO2 / NaN3 / HCl / H2O

Question

Which reagents are used to prepare nitrous acid in situ?

Solution

Final Answer

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