Final answer:
Nitrous acid has the formula HNO2 and plays important roles in industrial processes and chemistry due to its weak acidic nature.
Explanation:
The formula of nitrous acid is HNO2. Nitrous acid, although not isolated as a pure compound, is essential in various industrial processes like hydroxylamine production and diazotization. It is a weak acid with a pKa of 3.15 at 25°C.
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