6th edition, 14.15b

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Hai-Lin Yeh 1J
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6th edition, 14.15b

Postby Hai-Lin Yeh 1J » Thu Feb 28, 2019 6:25 am

Write the half-reactions and devise a galvanic cell (write a cell diagram) to study each of the following reactions:
(b) H+ (aq) + OH-(aq) -> H2O(l), the Brønsted neutralization reaction

Why can we not use the equations: 2 H+ + 2 e- -> H2 , H2 + 2 OH- -> 2 H2O + 2 e- to get the redox reaction?
Also, why is H2O not included in the cell diagram in the solutions manual?

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Re: 6th edition, 14.15b

Postby Chem_Mod » Thu Feb 28, 2019 7:01 am

It says that they are using the Bronsted Neutralization reaction and so that incorporates the half reactions

O2 + 4H+ +4e- 2H2O
O2 + 2H2O + 4e- -> 4OH-

While the other half reactions might yield the same electric potential, it does not satisfy the neutralization reaction as it does not involve and acid and a base neutralizing one another.

Water is not included in the cell diagrams because technically with aqueous solutions, they are by definition a solute with water so it'd be redundant to add water.

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