Question

Balance the half-reaction below for basic solution: NH4+(aq) → N2H4(aq) Which one of the following statements...

Balance the half-reaction below for basic solution:

NH4+(aq) → N2H4(aq)

Which one of the following statements is correct? You should use the smallest possible integer coefficients in the balanced equation.

[Note that H2O(l) and OH–(aq) may have to be added where necessary to balance the equation.]

2OH– appears on the left; this is an oxidation.
4OH– appears on the left; this is an oxidation.
2OH– appears on the right; this is a reduction.
4OH– appears on the left; this is a reduction.
4OH– appears on the right; this is an reduction.
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Homework Answers

Answer #1

NH4+    —> N2H4

Balance N:

2NH4+    —> N2H4

oxidation state of N changes from -3 to -2

This is oxidation since oxidation state is increasing.

Balance electron:

2NH4+    —> N2H4 + 2e-

Balance H:

2NH4+    —> N2H4 + 2e- + 4 H+

Replace H+ with OH- as this is basic

2NH4+ + 4 OH-   —> N2H4 + 2e- + 4 H+ + 4 OH-

Replace H+ + OH- with H2O

2NH4+ + 4 OH-   —> N2H4 + 2e- + 4 H2O

4OH– appears on the left; this is an oxidation.

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