Home
Class 12
CHEMISTRY
The standard potential of a cell using t...

The standard potential of a cell using the reaction `+3HgO(s)+2(overset(c-)(O)H) (aq)` is `0.489V` at `25^(@)C`. What is the equilibrium constant of the reaction ?

Text Solution

Verified by Experts

Anode `: MnO_(4)^(c-)+2H_(2)O+3e^(-) rarrMnO_(2)(s)+4overset(c-)(O)H]xx2 ` Cathode `: Hg(s)+2overset(c-)(O)H rarr H_(2)O+HgO+2e^(-)]xx3`

Cell is in equilibrium,
`:. E_(cell)=0`
`=E_(cell)=E^(c-)._(cell)-(0.059)/(6)log K`
`:. log K =(nE^(c-)._(cell))/(0.059)=(6xx0.489)/(0.059)=49.56`
`K=3.631xx10^(49)`
Promotional Banner

Topper's Solved these Questions

  • ELECTROCHEMISTRY

    CENGAGE CHEMISTRY ENGLISH|Exercise Solved Examples(Electrolysis And Electrolytic Cells)|12 Videos

  • ELECTROCHEMISTRY

    CENGAGE CHEMISTRY ENGLISH|Exercise Ex 3.1 (Objective)|28 Videos

  • ELECTROCHEMISTRY

    CENGAGE CHEMISTRY ENGLISH|Exercise Archieves Subjective|35 Videos

  • D AND F BLOCK ELEMENTS

    CENGAGE CHEMISTRY ENGLISH|Exercise Archives Subjective|29 Videos

  • GENERAL PRINCIPLES AND PROCESS OF ISOLATION OF ELEMENTS

    CENGAGE CHEMISTRY ENGLISH|Exercise Archives (Subjective)|14 Videos

Similar Questions

Explore conceptually related problems

The standard reduction potential at 25^(@)C of the reaction 2H_(2)O+2e^(-)hArrH_(2)+2overset(Θ)(O)H is -0.8277V . Calculate the equilibrium constant for the reaction. 2H_(2)OhArrH_(3)O^(o+)+overset(Θ)(O)H at 25^(@)C .

The E_("cell") of the reaction MnO_(4)^(-)+Fe^(+2)+H^(+)rarrMn^(2+)+H_(2)O is 0.59 V at 25^(@)C The equilibrium constant for the reaction is

The equilibrium constant (K_(c)) for the reaction 2HCl(g)hArrH_(2)(g)+Cl_(2)(g) is 4xx10^(-34) at 25^(@)C .what is the equilibrium constant K_p for the reaction ?

The standard emf for the cell reaction, 2Cu^(+)(aq)toCu(s)+Cu^(2+)(aq) is 0.36V at 298K . The equilibrium constant of the reaction is

The standard emf of a galvanic cell involving cell reaction with n = 2 is found to be 0.295 V at 25^(@)C . The equilibrium constant of the reaction would be (Given F=96,500 C mol^(-1), R = 8.314 JK^(-1) mol^(-1) ):

E_"cell"^@ for the reaction , 2H_2O to H_3O^(+) + OH^(-) at 25^@C is -0.8277 V. The equilibrium constant for the reaction is

E^(@) for the cell Zn(s)|Zn^(2+)(aq)|Cu^(2+)(aq)|Cu(s) is 1.1V at 25^(@)C the equilibrium constant for the cell reaction is about

The standard potential of a cell using the reaction is 1.12 . The heat of the reaction is -504.2kJ mol ^(-1) at 25^(@)C . Calculate the entropy change.

At 25^(@)C , the standard emf of a cell having reaction involving two electrons change is found to be 0.295 V. The equilibrium constant of the reaction is :

Use the standard potentials of the couples Au^(+)//Au(+1.69V),Au^(3+)//Au(+1.40V), and Fe^(3+)//Fe^(2+)(+0.77V) to calculate the equilibrium constant for the reaction 2Fe^(2+)(aq)+Au^(3+)(aq) leftrightarrow2Fe^(3+)(aq)+Au^(+)(aq)

CENGAGE CHEMISTRY ENGLISH-ELECTROCHEMISTRY-Solved Examples (Electrochemical Cell)
  1. Given : NO(3)^(-) rarrNO(2)( acidic medium ), " "E^(-)=0.8V N...

    Text Solution

    |

  2. The standard potential of a cell using the reaction is 1.12. The heat...

    Text Solution

    |

  3. The standard potential of a cell using the reaction +3HgO(s)+2(overse...

    Text Solution

    |

  4. The EMF of the cell : Ag|AgCl,0.1 MKCl||0.1 M AgNO(3)|Ag is 0.45V. 0...

    Text Solution

    |

  5. Calculate the potential corresponding to the following cell. Given P...

    Text Solution

    |

  6. Estimate the E^(@) reduction for Cu|CuS electrode. Given : K(sp) of...

    Text Solution

    |

  7. Knowing that K(sp) for AgCl is 1.0 xx 10^(-10), calculate E for a silv...

    Text Solution

    |

  8. Consider the following half reactions : PbO(2)(s)+4H^(o+)(aq)+SO(4)...

    Text Solution

    |

  9. The e.m.f of cell Ag|AgI((s)),0.05M KI|| 0.05 M AgNO(3)|Ag is 0.788 V....

    Text Solution

    |

  10. For the cell Zn|ZnCl(2)(m)|AgCl,E is 1.24V at 25^(@)C and 1.260V at 35...

    Text Solution

    |

  11. A saturated calomel electrode is coupled through a salt bridge with a ...

    Text Solution

    |

  12. Two weak acid solutions HA(1) and HA(2) with the same concentration an...

    Text Solution

    |

  13. Find the solubility of AgCl in 0.1 M CaCl(2). E^(c-).(Ag^(o+)|Ag)=0.79...

    Text Solution

    |

  14. The EMF of the cell : Ag|Ag(2)CrO(4)(s),K(2)CrO(4)(0.1 M)||AgNO(3)(0...

    Text Solution

    |

  15. The EMF of a galvanic cell Pt|H(2)(1 atm)|HCl(1M)|Cl(2)(g)|Pt is 1.29V...

    Text Solution

    |

  16. Calculate the potential of silver electrode in a saturated solution of...

    Text Solution

    |

  17. A solution of Fe^(2+) is titrated potentiaometrically using Ce^(4+) so...

    Text Solution

    |

  18. Find the EMF of the cell at 25^(@)C. E^(c-).(red("quinhydrone elec...

    Text Solution

    |

  19. Construct a cell using given electrodes at 298K and also calculate its...

    Text Solution

    |

  20. The EMF of the following cell is observed to be 0.118V at 25^(@)C: ...

    Text Solution

    |