The reduction of oxygen gas in 1M aqueous acid is represented by this equation Eo-1-23V O2g-4H-aq-4e- 2H2OlThe potential for this reaction at physiological pH- where -H-1-10-7 and the partial pressure of O2 is 1 atm- will be closest to which value-

Given E _ 0 =1.23 V & [ H ^ +1 ]=1× 10 ^ 7 E= E _ 0 0.059 4 log 1 [ H ^ +1 ] ^ 4 =1.23 0.059 4 log 1 [ 10 ^ 7 ] ^ ...

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Salt of Weak Acid and Weak Base

The reduction...

Question

The reduction of oxygen gas in $1 M$ aqueous acid is represented by this equation ( $E^{o} = 1.23 V$ )
$O_{2} (g) + 4 H^{+} (a q) + 4 e^{-} \to 2 H_{2} O (l)$
The potential for this reaction at physiological pH, where $[H^{+}] = 1 \times 10^{- 7}$ and the partial pressure of $O_{2}$ is $1$ atm, will be closest to which value?

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2 H_{2} (g) + O_{2} (g) \to 2 H_{2} O (l) △ S_{298}^{0} = - 0.32 {kJK}^{- 1}

△_{f} H_{298}^{0} (H_{2} 0, l)

O_{2} (g) + 4 H^{+} (a q) + 4 e^{-} \to 2 H_{2} 0 (l); E^{0} = 1.23 V

2 F e (s) + O_{2} (g) + 4 H^{+} (a q) \to 2 F e^{2 +} (a q) + 2 H_{2} O (l); E^{o} = 1.67 V

[F e^{2 +}] = 10^{- 3} M, P_{O_{2}} = 0.1

p H = 3

^{o} C

2 H_{2} (g) + O_{2} (g) ⟶ 2 H_{2} O (l); △_{r} S_{298}^{\circ} = - 0.32 k J / K

△_{f} H_{298}^{\circ} (H_{2} O, l)

O_{2} (g) + 4 H^{+} (a q .) + 4 e^{-} ⟶ 2 H_{2} O (l); E^{\circ} = 1.23 V

2 H_{2} O \to O_{2} + 4 H^{+} + 4 e^{-}; E^{\circ} = - 1.23 V

J m o l^{- 1} K^{- 1};

O_{2} (g)

⎡ ⎢ ⎢ ⎢ ⎢ ⎢ ⎣ \begin{matrix} (c o r r e c t) C u (s) ⟶ & C u^{2 +} (a q) + 2 e^{-} E_{C u | C u^{2 +}}^{⊝} = - 0.34 V (w r o n g) 2 H_{2} O (l) ⟶ & O_{2} (g) + 4 H^{\oplus} (a q) + 4 e^{-} E_{H_{2} O | O_{2}}^{⊝} = - 1.23 V \end{matrix} ⎤ ⎥ ⎥ ⎥ ⎥ ⎥ ⎦

\begin{matrix} I n (d) \end{matrix}

⎡ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎣ \begin{matrix} (c o r r e c t) N i (s) ⟶ & N i^{2 +} (a q) + 2 e^{-} E_{N i | N i^{2 +}}^{⊝} = - 0.25 V (w r o n g) 4 ⊝ O H (a q) ⟶ & O_{2} (g) + 2 H_{2} O (l) + 4 e^{-} E_{⊝ O H | O_{2}}^{\oplus} = - 0.4 V \end{matrix} ⎤ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎦

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