The If Ur What is the coefficient of the permanganate ion when the following equ

Question

The If Ur
What is the coefficient of the permanganate ion when the following equation is balanced? MnO_4^- + Br^- - Mn^2+ + Br_2 (acidic solution) 5 3 1 2 4 Cathodic protection of a metal pipe against corrosion usually entails_______. Attaching a dry cell to reduce any metal ions which might be formed coating the pipe with another metal whose standard reduction potential is less negative than that of the pipe attching an active metal to make the pipe the anide in an electrochemical cell attching an active metal to make the pipe the cathode in an electrochemical cell coating the pipe with a fluropolymer to act as a source of fluoride ion (since the latter is so hard to oxidize)

Explanation / Answer

1)

MnO4 - + Br- --> Mn+2 and Br2

split

MnO4 - --> Mn+2

Br- --> Br2

Balance atoms

MnO4 - --> Mn+2

2Br- --> Br2

Blance O

MnO4 - --> Mn+2 + 4H2O

2Br- --> Br2

balance H

8H+ + MnO4 - --> Mn+2 + 4H2O

2Br- --> Br2

balance charges

5e- + 8H+ + MnO4 - --> Mn+2 + 4H2O

2Br- --> Br2 + 2e-

balance electrons

10e- + 16H+ + 2MnO4 - --> 2Mn+2 + 8H2O

10Br- --> 5Br2 + 10e-

add both

10e- + 16H+ + 2MnO4 - + 10Br-  --> 2Mn+2 + 8H2O +  5Br2 + 10e-

Cancel common terms

16H+ + 2MnO4 - + 10Br-  --> 2Mn+2 + 8H2O +  5Br2

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