Chapter 8.2, Problem 21PP

Interpretation Introduction

Interpretation:

The acid ${\text{HClO}}_2$ should be named.

Concept introduction:

Hydrogen ion is attached to acid and acids are named on the basis of their anion. Acids are the molecular compound which contains one or more hydrogen atoms when dissolved in water.

Answer to Problem 21PP

Name of the compound ${\text{HClO}}_2$ is chlorous acid.

Explanation of Solution

Given acid is ${\text{HClO}}_2$. In the compound, polyatomic anion is ${\text{ClO}}_2{}^{-}$ (chlorite). Oxyanion end with −ite, change the ending to −ous and add ‘acid’ word. Thus name of the compound is chlorous acid.

Conclusion

Number of hydrogen added to the polyatomic ion is equal to the change on cation. Acid formed from polyatomic ions have a naming system similar to polyatomic ion.