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Under standard conditions for all concen...

Under standard conditions for all concentrations, the following reaction is spontaneous at `25^@C` .
`O_2(g) + 4H^(+)(aq) + 4Br^(-)(aq) = 2H_2O (l) + 2Br_2(l)`
If `[H^+]` is decreased so that the pH = 3.6, what value will `E_("cell")` have, and will the reaction be spontaneous at this `[H^+]` ?

Text Solution

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`-0.05 V, No`
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Under standard conditions for all concentrations, the following reactions is spontaneous at 25^@C O_2(g)+4H^+ (aq)+4Br^(-) (aq) to 2H_2O (l) +2Br_2 (l), E^@=0.16V IF [H^+] is adjusted by adding a buffer of 0.10 M NaOCN and 0.10 M HOCN (K_a=3.5 times 10^-4) what value will E_(cell) have and will the reaction be spontaneous at this [H^+] ?

Under standard conditions for all concentrations, the following reaction is spontaneous at 25^@C . O_2(g) + 4H^(+)(aq) + 4Br^(-) (aq) to 2H_2O (l) + 2Br_2(l) , E^@ = 0.17V If [H^+] is adjusted by adding a buffer of 0.10 M NaOCN and 0.10 M HOCN (K_a = 3.5 xx 10^(-4)) , what value will E_("cell") have, and will the reaction be spontaneous at this [H^+] ?

Knowledge Check

  • Observe the following reaction, 2NO_(2)(g) + 2OH^(-)(aq) to NO_(3)^(-)(aq) + H_(2)O (l) + NO_(2)^(-) (aq) in this reaction,

    A
    `OH^(-)` is oxidised to `H_(2)O`
    B
    `OH^(-)` is reduced to `H_(2)O`
    C
    `NO_(2)`(g) is reduced to `NO_(2)^(-)` (aq) and oxidised to `NO_(3)^(-)` (aq)
    D
    `NO_(2)`(g) is reduced to `NO_(3)^(-)`(aq) and oxidised to `NO_(2)^(-)` (aq)

  • Based on the cell notation for a spontaneous reaction, at the anode: Ag (s) | AgCl (s) |Cl^(-) (aq) || Br^(-) (aq) |Br_(2) (l) | C (s)

    A
    AgCl gets reduced
    B
    Ag gets oxidized
    C
    `Br^(-)` gets oxidized
    D
    `Br_(2)` gets reduced

  • Which of the following is correct regarding the reaction of fluorine with water ? 2F_(2)(g) + 2H_(2)O(l) to 4H^(+) (aq) + 4F^(-) (aq) + O_(2)(g)

    A
    Fluorine is oxidized to `F^(-)`
    B
    Water is oxidized to `O_(2)`
    C
    Water is reduced to `H^(+)`
    D
    Oxidation state of fluorine does not change

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