Home
Class 12
CHEMISTRY
The following electrochemical cell has b...

The following electrochemical cell has been set up.
`Pt_((I))|Fe^(3+), Fe^(2+)(a=1)||Ce^(4+), CE^(3+)(a=1)|Pt_((II))`
If an ammmeteris connected between the two platinum electrode, prediect the direaction of flow of current. Will the current increases or decrease with time?

Text Solution

Verified by Experts

The `e.m.f.` of given cell `= E_(OP_(Fe^(2+)//Fe^(3+)))+E_(RP_(Ce^(3+)//Ce^(4+)))`
or `E_(cell)=E_(OP_(Fe^(2+)//Fe^(3+)))^(@)-(0.059)/(1)"log"([Fe^(3+)])/([Fe^(2+)])`
`+E_(RP_(Ce^(3+)//Ce^(4+)))^(@)+(0.059)/(1)"log"([Cr^(4+)])/([Ce^(3+)])`
`= E_(OP_(Fe^(2+)))^(@)+E_(RP_(Ce^(4+)))^(@)+(0.059)/(1)"log"([Ce^(4+)][Fe^(2+)])/([Ce^(3+)][Fe^(3+)])`
`= -0.77+1.61+(0.059)/(1)"log1 :. E_(cell) = 0.84V`
Thus, `Pt_((I))Fe^(3+)//Ce^(3+)` acts as anode and `Pt_((II))Ce^(4+)//Ce^(3+)` acts as cathode. The electrons flow from left to right and thus current will flow from right to left. The current strength will decrease with time.
Promotional Banner

Topper's Solved these Questions

  • ELECTROCHEMISTRY

    P BAHADUR|Exercise Exercise (3A) OBJECTIVE PROBLEMS: (Only One Option is Correct)|4 Videos

  • ELECTROCHEMISTRY

    P BAHADUR|Exercise Exercise (3B) OBJECTIVE PROBLEMS: (More than One OptIons are Correct)|1 Videos

  • ELECTROCHEMISTRY

    P BAHADUR|Exercise (D) ELECTROCHEMICAL SERIES|1 Videos

  • DILUTE SOLUTION AND COLLIGATIVE PROPERTIES

    P BAHADUR|Exercise Exercise 9 Advanced Numerical|12 Videos

  • MOCK TEST PAPER

    P BAHADUR|Exercise Exercise|92 Videos

Similar Questions

Explore conceptually related problems

The following electrochemical cell is represented as : Pt(1)|Hg^(2+),Hg_(2)^(2+)(a=1)||Ce^(4+),Ce^(3+)(a=1)|Pt(2) a. If an ammeter is connected between two platinum electrodes, predict the direction of flow of current. b. Will the current decrease or increase with time? Given :E^(c-)._(2Hg^(2+)|Hg_(2)^(2+))=0.92V,E^(c-)._(Ce^(4+)//Ce^(3+))=1.61V

The following electrochemical cell has been set up. Pt_((I))|Fe^(3+),Fe^(2+)(c=1)||Ce^(4+),Ce^(3+)(c=1)|Pt_((II)) E_(Fe^(3+)//Fe^(2+))=0.77V and E_(Ce^(4+)//Ce^(3+))^(@)=1.61V If an ammeter is connected between the two platinum electrode, predict the direction of flow of current. Will the current increase or decrease with time ?

The following electrochemical cell has been set-up, Pt(1)|Fe^(3+), Fe^(2+) (a=1)||Ce^(4+), Ce^(3+) (a=1) Pt (2) E^(@) (Fe^(3+) //Fe^(2+))=0.77 V, E^(@) (Ce^(4+)//Ce^(3+))=1.61 V If an ammeter is connected between the two platinum electrodes, predict the direction of flow of current. Will the current increase or decrease with time ?

The following electrochemical cell has been set up : Pt(l)|Fe^(3+),Fe(a=1)|Ce^(4+),Ce^(3+)(a=1)|Pt(2) E^(c-)._(((Fe^(3+),Fe^(2+)))=0.77V and E^(c-)._(((Ce^(4+),Ce^(3+)))=1.61V If an ammeter is connected between two platinum electrodes, predict the direction of the flow of current. Will the current increase or decreases with time ?

The electrochemical cell is set up as pt, H_(2)(1 atm)| HCl (0.1 M)|| CH_(3)COOH (0.1 M) | H_(2) (1 atm) , pt. The emf of the cell is (Ka =10^(-3) xx 1.8 )

Knowledge Check

  • An electrochemical cell is set up as : Pt H_(2) (1 atm) | HCl (0.1 M) || CH_(3) COOH (0.1 M) | H_(2) (1 atm) Pt. The e.m.f. of this cell wil not be zero , because

    A
    the temperature is constant.
    B
    e.m.f depends on molarities of acids used
    C
    acids used in two compartments are different .
    D
    pH of 0.1 M HCl and 0.1 M `CH_(3) COOH` is not same

  • The electrochemical cell is set up as pt, H_(2)(1 atm)| HCl (0.1 M)|| CH_(3)COOH (0.1 M) | H_(2) (1 atm) , pt. The emf of the cell is (Ka =10^(-3) xx 1.8 )

    A
    0
    B
    Positive
    C
    Negative
    D
    Cannot be determined

  • An electrochemical cell is set up as follows : Pt (H_(2) , atm ) | 0.1 M HCl |0.1 M acetic acid | (H_(2) , 1 atm ) Pt EMF of this cell will not be zero because

    A
    the temperature is constant
    B
    the pH of 0.1 M HCl and 0.1 M acetic acid is not the same
    C
    acids used in the two compartments are different
    D
    EMF of a cell depends on molarities of the acids used.