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Given 2H(2)O rarr O2 + 4H^+ + 4e^- , E0 ...

Given `2H_(2)O rarr O_2 + 4H^+ + 4e^-` , `E_0 = -1.23 V`. Calculate electrode potential at pH = 5.

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The correct Answer is:
-0.93 V
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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 Calculate the potential of a cell of pH = 7 in which the cell reaction is- Na_(2)CO_(3)(aq) +H_(2)O(l) rarr NaHCO_(3)(aq).+NaOH(aq)

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) .

Given that, Co^(3+) +e^(-)rarr Co^(2+) , E^(@) = +1.82 V 2H_(2)O rarr O_(2) +4H^(+) +4e^(-), E^(@) =- 1.23 V . Explain why Co^(3+) is not stable in aqueous solutions.

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 The value of pK_(a) for HCO_(3)^(Theta) (aq) is (approx):

The standard reduction potential for the half cell : NO_(3)^(c-)(aq)+2H^(c-) +e^(-) rarr NO_(2)(g)+H_(2)O is 0.78V . Calculate the reduction potential in 8M H^(o+) .

50mL of 0.1M CuSO_(4) solution is electrolysed with a current of 0.965A for a period of 200sec. The reactions at electrodes are: Cathode: Cu^(2+) +2e^(-) rarr Cu(s) Anode: 2H_(2)O rarr O_(2) +4H^(+) +4e . Assuming no change in volume during electrolysis, calculate the molar concentration of Cu^(2+),H^(+) and SO_(4)^(2-) at the end of electrolysis.

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