Chapter 8.2, Problem 19PP

Interpretation Introduction

Interpretation:

The name of HI needs to be determined.

Concept introduction:

The given acid is an aqueous solution of a 7th group element of the periodic table. (Halogen series). 

Answer to Problem 19PP

${\text{HI}}_{\text{aq}}\text{:Hydroiodic Acid}$

Explanation of Solution

$\text{HI}$ is a combination of ${\text{H}}_{}^{\text{+}}\text{(Hydrogen ion)}$ and ${\text{I}}^{-}\text{(Iodide ion)}$.

${\text{HI}}_g$ is named as hydrogen Iodide. When Hydrogen Iodide is dissolved in water it becomes

Hydroiodic acid.

${\text{HI}}_{\text{aq}}$ is an acid because it gives hydrogen ion in the aqueous solution.

Conclusion

Hence the name of the compound is hydroiodic acid.