Question

How would you write these chemical reactions?Can someone do one or two reactions for each problem, so I could get an idea of to them? ..I'm nit sure how most of the oeoducts wouls turn out..especially if it is a precipitate.


5. When Mn^2+ ions are separated from the mixture, they undergo a series of oxidizing and reducing steps. Write the reactions that describes these processes.

(a) Oxidation: Mn^2+(aq) + H2O2(aq) ---->
(b) Reduction: MnO2(s) + H2O2(aq) ---->
(c) Oxidation: Mn^2+(aq) + BiO3^-(aq) ---->


6. Ammonia is used to separate Fe^3+ from Cu^2+ and Zn^2+ from Al^3+. In each of these cases, one ion forms a precipitate, and the other ion remains in solution as a complex. Write chemical equations for each of the following reactions.

(a) Fe^3+(aq) + NH3(aq) + H2O(l) ---->
(b) Cu^2+(aq) + NH3(aq) + H2O(l) ---->
(c) Zn^2+(aq) + NH3(aq) + H2O(l) ---->
(d) Al^3+(aq) + NH3(aq) + H2O(l) ---->

7. Al^3+ and Zn^2+ ions are amphoteric. Describe how the amphoteric nature of these ions is shown in your testing.

(a) Al(OH)3(s) + H^+(aq) ---->
(b) Al(OH)3(s) + OH^-(aq) ---->
(c) Zn(OH)2(s) + H^+(aq) ---->
(d) Zn(OH)2(s) + OH^-(aq) ---->

Answer 1

None of these is balanced.
5a. Mn^2+ + H2O2 ==> MnO2 + H2O
b. unclear to me
c. Mn^2+ + BiO3^- ==> MnO4^- + Bi^3+

6.
a & b.
Fe^3+ + NH3 + H2O ==> Fe(OH)3(s)
Cu + NH3(aq) ==> Cu(NH3)4]^2+(aq)

c & d.
Zn^2+ + NH3(aq) ==> Zn(NH3)4]^2+(aq)
Al + NH3 + H2O ==> Al(OH)3(s)

7.
Al(OH)3 + H^+ ==> H2O + Al^3+(aq)
Al(OH)3 + OH^- ==> [Al(OH)4]^-(aq)

Zn(OH)2 + H^+ ==> H2O + Zn^2+(aq)
Zn(OH)2 + OH^- ==> [Zn(OH)4]^2-(aq)
Note: none of these equations is balanced.

Answer 2

Ahh!! Sorry for the grammar errors. :/ I was typing on my phone...thank you so much DrBob222! ^^
Do you think you might be able to explain how the reactants resulted into such a product for problem #6 and 7? I will presume problem #5 is a double replacement?