Chapter 4, Problem 17A

Interpretation Introduction

Interpretation:

The missing names and formulas are to be completed.

Concept introduction:

Oxyanion is a class of polyatomic ions. Polyatomic ion involves more than one atom which carries a net charge and exists as a single unit. Oxyanion is an anion of oxygen and another non-metal. For example: sulphate ion $(S{O}_4{}^{2-})$ , Phosphate ion $(P{O}_4{}^{3-})$

Answer to Problem 17A

Formula	Name
$Br{O}^{-}$	Hypobromite
$I{O}_3{}^{-}$	Iodate
$I{O}_4{}^{-}$	Periodate
$I{O}^{-}$	hypoiodite

Explanation of Solution

The rules which are used to name series of oxyanions are:

• The standard anion ends with ‘ate’.
• For the anion carrying one more oxygen, prefix ‘per’ is used.
• The anion carrying one less oxygen atom ends with ‘ite’.
• The anion carrying two less oxygen ends with ‘ite’ and prefix ‘hypo’ is also used.

  $Br{O}_3{}^{-}$ is bromate ion. So, $Br{O}^{-}$ is hypobromite ion.

  $I{O}_3{}^{-}$ is iodate ion. So, $I{O}_4{}^{-}$ is periodate ion and hypoiodite is $I{O}^{-}$ .

Conclusion

Thus, series of oxyanions are named according to number of oxygen atoms relative to reference oxyanion.