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One ecologically important equilibrium i...

One ecologically important equilibrium is that between carbonate and hydrogen carbonate ions in natural water. This standard Gibb's energies of formation of `CO_(3)^(-2)(aq)` and `HCO_(3)^(Theta)(aq)` are `-527.8 kJ mol^(-1)` and `-586.8 kJ mol^(-1)` respectively.
For water,
`2H_(2)O(l) +2e^(Theta) rarr H_(2)(g) +2OH^(Theta)(aq) , E_(RP)^(Theta) =- 0.83 V`
`2H_(2)O rarr O_(2) +4H^(+) +4e^(Theta), E_(OX)^(Theta) = - 1.23V`
What is the standard potential Couple of `HCO_(3)^(-)//CO_(3)^(-2),H_(2)`.

A

[A] `-0.22` volt

B

[B] +0.193 volt

C

[C] -0.0135 volt

D

[D] `+0.41` volt

Text Solution

Verified by Experts

The correct Answer is:
B
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