Question

Assuming each pair of half-reactions below takes place in an acidic solution, write a balanced equation for the overall reaction.

a) 3Fe²+ + Cr₂O₇²- → 3Fe³+ + Cr³+

b) 8H⁺ + MnO₄⁻ + 5e⁻ → Mn²+ + 4H₂O

c) 6H⁺ + Br₂ + 6e⁻ → 2Br⁻

d) 5H₂O₂ → 2H₂O + O₂

Answer 1

To write a balanced equation for the overall reaction in an acidic solution, combine the given half-reactions and cancel out redundant species. The overall equation is 6Fe²+ + 2Cr₂O₇²- + 14H⁺ → 6Fe³+ + 2Cr³+ + 7H₂O.

Step-by-step explanation:

To write a balanced equation for the overall reaction in an acidic solution, we need to combine the given half-reactions and cancel out any redundant species. Here are the balanced equations for each half-reaction:

(a) 3Fe²+ + Cr₂O₇²- → 3Fe³+ + Cr³+

(b) 8H⁺ + MnO₄⁻ + 5e⁻ → Mn²+ + 4H₂O

(c) 6H⁺ + Br₂ + 6e⁻ → 2Br⁻

(d) 5H₂O₂ → 2H₂O + O₂

Combining these equations and canceling out the electrons, we get the balanced overall reaction in an acidic solution:

6Fe²+ + 2Cr₂O₇²- + 14H⁺ → 6Fe³+ + 2Cr³+ + 7H₂O