Respuesta :
Answer:
[tex]\rm Be(OH)_2[/tex] and [tex]\rm (NH_4)_2 SO_4[/tex]. The missing ion would be [tex]\rm OH^{-}[/tex].
Explanation:
In a double replacement reaction, two ionic compounds exchange their ions to produce two different ionic compounds.
In this question, the two ionic compounds are:
- [tex]\rm BeSO_4[/tex], and
- [tex]\rm NH_4 OH[/tex].
In particular,
- [tex]\rm BeSO_4[/tex] is made up of [tex]\rm Be^{2+}[/tex] ions and [tex]\rm {SO_4}^{2-}[/tex] ions, while
- [tex]\rm NH_4 OH[/tex] is made up of [tex]\rm {NH_4}^{+}[/tex] ions and [tex]\rm OH^{-}[/tex] ions.
In a binary ionic compound, cations (positive ions) can only bond to anions (negative ions.)
- [tex]\rm Be^{2+}[/tex] is a cation. In [tex]\rm BeSO_4[/tex], [tex]\rm Be^{2+}[/tex] was bounded [tex]\rm {SO_4}^{2-}[/tex] anions. During the reaction, it bonds with [tex]\rm OH^{-}[/tex] anions to produce [tex]\rm Be(OH)_2[/tex].
- [tex]\rm {NH_4}^{+}[/tex] is also a cation. In [tex]\rm NH_4 OH[/tex], [tex]\rm {NH_4}^{+}[/tex] was bounded to [tex]\rm OH^{-}[/tex] ions. During the reaction, it bonds with [tex]\rm {SO_4}^{2-}[/tex] anions to produce [tex]\rm (NH_4)_2 SO_4[/tex].
Hence, the two products will be [tex]\rm Be(OH)_2[/tex] and [tex]\rm (NH_4)_2 SO_4[/tex].
Note that charges on the ions must balance. For example, a [tex]\rm Be^{2+}[/tex] ion carries twice as much charge as an [tex]\rm {NH_4}^{+}[/tex] ion. As a result, each [tex]\rm Be^{2+}[/tex] ion would bond with twice as many [tex]\rm OH^{-}[/tex] ions as [tex]\rm {NH_4}^{+}[/tex] would in [tex]\rm NH_4 OH[/tex].