Question

part 4 (1 point) write the chemical formula of nitrous acid:

Explanation:

Step1: Recall acid - naming rules

Acids containing a polyatomic anion with the ending “-ite” have the prefix “hydro -” removed and the ending changed to “-ous acid”. The nitrite ion is $NO_2^{-}$.

Step2: Determine the formula

To form an acid, we add a hydrogen ion ($H^{+}$) to balance the charge. Since the charge of the nitrite ion is - 1 and the charge of a hydrogen ion is + 1, one hydrogen ion is needed.

Answer:

$HNO_2$