Home
Class 12
CHEMISTRY
Given : NO(3)^(-) rarrNO(2)( acidic me...

Given `:`
`NO_(3)^(-) rarrNO_(2)(` acidic medium `), " "E^(-)=0.8V`
`NO_(3)^(-) rarr NO_(3)OH(` acidic medium`)" "E^(-)=0.74V`
At what `pH` the above two half reactions will have same `EMF` values ? Assume the concentration of all the species to be unity. `(` Take `0.059~~0.06)`

Text Solution

Verified by Experts

The correct Answer is:
`pH=1.5`
`overset(+5)(N)O_(3)^(-)+2H^(+)+e^(-)tooverset(+4)(N)O_(2)+H_(3)O,0.79"volt"`
`overset(+5)(N)O_(3)^(-)+8H^(+)+6e^(-)toNH_(3)OH^(+)+2H_(2)O,0.731"volt"`
`E=0.79-(0.0591)/(1)log((1)/([H^(+)]^(2)))=0.731-(0.591)/(6)log((1)/([H^(+)]^(8)))`
`0.059=0.059(2-(8)/(6))pHimpliespH=(6)/(4)=1.5`
Promotional Banner

Topper's Solved these Questions

  • ELECTROCHEMISRY

    RESONANCE ENGLISH|Exercise Assertion Reasoning|11 Videos

  • ELECTROCHEMISRY

    RESONANCE ENGLISH|Exercise Subjective Questions|14 Videos

  • ELECTROCHEMISRY

    RESONANCE ENGLISH|Exercise Board Level Exercise|20 Videos

  • ELECTRO CHEMISTRY

    RESONANCE ENGLISH|Exercise PHYSICAL CHEMITRY (ELECTROCHEMISTRY)|53 Videos

  • EQUIVALENT CONCEPT & TITRATIONS

    RESONANCE ENGLISH|Exercise Part -IV|22 Videos

Similar Questions

Explore conceptually related problems

Balance the equation, As_(2)S_(3)+NO_(3)^(-) rarr AsO_(4)^(3-)+NO+S (in acidic medium).

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 . a. Calculate the reduction potential in 8M H^(o+) . b. What will be the reduction potential of the half cell in a neutral solution ? Assume all the other species to be at unit concentration.

For the redox reaction Zn+NO_(3)^(-)rarr Zn^(2+)+NH_(4)^(-) is basic medium, coefficients of Zn, NO_(3)^(-) and OH^(-) in the balanced equation respectively are :

E_(Mn^(2+)//MnO_(4)^(-))^(0)=-1.51V E_(MnO_(2)//Mn^(+2))^(0)=+1.23V E_(MnO_(4)^(-)//MnO_(2)=? (All in acidic medium)

The reduction of NO_(3)^(-) occurs as No_(3)^(-) + 4H^(+) + 3e^(-) rightarrow NO+ 2H_(2)O, E^(@) = 0.96V If the reaction originally starts with 1M of NO_(3)^(-) and 5M of H^(+) and the reaction goes to 80% completion such that under those conditions of temperature the pressure of NO_(g) was 2 bar. Find the reduction potential of the remaining solution.

Balance the following reaction in acidic medium. CuS+NO_(3)^(ө)rarrcu^(2+)+S_(8)+NO

The standard oxidation potential for the half-cell NO_(2)^(-)(g)+H_(2)OtoNO_(3)^(-)(aq)+2H^(+)(aq)+2e is -0.78V . Calculate the reduction in 9 molar H^(+) assuming all other species at unit concentration. What will be the reduction potential in neutral medium?

E^(c-) for Cr^(3+)+3e^(-) rarr Cr and Cr^(3+)+e^(-) rarr Cr^(2+) are -0.74 V and -0.40V , respectively, E^(c-) for the reaction is Cr^(+2)+2e^(-) rarr Cr

Ag^(+) + e^(-) rarr Ag, E^(0) = + 0.8 V and Zn^(2+) + 2e^(-) rarr Zn, E^(0) = -076 V . Calculate the cell potential for the reaction, 2Ag + Zn^(2+) rarr Zn + 2Ag^(+)

Given standard E^(c-): Fe^(3+)+3e^(-)rarrFe," "E^(c-)=-0.036 Fe^(2+)+2e^(-)rarr Fe," "E^(c-)=-0.440V The E^(c-) of Fe^(3+)+e^(-) rarr Fe^(2+) is

RESONANCE ENGLISH-ELECTROCHEMISRY-Exercise
  1. Equinormal solution of two weak acids, HA(pK(a) =3) and HB(pK(a) =5) a...

    Text Solution

    |

  2. In two vessels each containing 500mL water, 0.05m mol of aniline (K(b)...

    Text Solution

    |

  3. Given : NO(3)^(-) rarrNO(2)( acidic medium ), " "E^(-)=0.8V N...

    Text Solution

    |

  4. The standard oxidation potential of Zn referred to SHE is 0.76V and th...

    Text Solution

    |

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

    Text Solution

    |

  6. The cell Pt, H(2) (1atm) H^(+) (pH =x)| Normal calomel Electrode has a...

    Text Solution

    |

  7. The EMF of the standard weston cadmium cell Cd(12.5%) in Hg|3CdSO(4)...

    Text Solution

    |

  8. triangleH for the reactio Ag(s)+(1)/(2)Hg(2)Cl(2)(s)toAgCo(s)+Hg(l) is...

    Text Solution

    |

  9. the standart emf of the cel Fe|Fe^(+2)(aq)||Cd^(+2)|Cd is 0.0372 V a...

    Text Solution

    |

  10. The voltage of a certain cell has standard potential at 25^(@)C and 20...

    Text Solution

    |

  11. Find the number of electrons involved in the electro-deposition of 63....

    Text Solution

    |

  12. A current 0.5 ampere when passed through AgNO(3) solution for 193 sec....

    Text Solution

    |

  13. A certain metal salt solution is electrolysed in series with a silver ...

    Text Solution

    |

  14. 3A current was passed through an aqueous solution of an unknown salt o...

    Text Solution

    |

  15. How long a current of 2 A has to be passed through a solution of AgNO(...

    Text Solution

    |

  16. A metal is know to form fluoride MF(2). When 10A of electricity is pas...

    Text Solution

    |

  17. A certain electricity deposited 0.54g of Ag from AgNO(3) solution what...

    Text Solution

    |

  18. A current of 3.6A is a passed for 6 hrs between Pt electrodes in 0.5L ...

    Text Solution

    |

  19. Find the volume of gases evolved by passing 0.9655. A current for 1 hr...

    Text Solution

    |

  20. Cd amalgam is preapred by electrolysis of a solution CdCI(2) using a ...

    Text Solution

    |