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In the button cell, widely used in watch...

In the button cell, widely used in watches, the following reaction takes place
`Zn(s)+Ag_(2)O(s)+H_(2)O to Zn^(2+)(aq)+2Ag(s)+2OH^(-)(aq)`
Determine `E^(@)` and `DeltaG^(@)` for the reaction.
(Given : `E_(Ag^(+)//Ag)^(@)=+0.80 V,E_(Zn^(2+)//Zn)^(@)=-0.76 V`

Text Solution

AI Generated Solution

To determine the standard cell potential \( E^\circ \) and the standard Gibbs free energy change \( \Delta G^\circ \) for the reaction given in the button cell, we can follow these steps: ### Step 1: Identify the Half-Reactions The overall reaction is: \[ \text{Zn(s)} + \text{Ag}_2\text{O(s)} + \text{H}_2\text{O} \rightarrow \text{Zn}^{2+}(aq) + 2\text{Ag(s)} + 2\text{OH}^-(aq) \] ...
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What type of a battery is the lead storage battery 7 Write the anode and the cathode reactions and the overall reaction occurring in a lead storage battery when current is drawn from it. (b) In the button cell, widely used in watches, the following reaction takes place : Zn(s) + Ag_(2)O (s) + H_(2)O (l) to Zn^(2+)(aq) + 2Ag (s) + 2OH^(-) (aq) Determine E^(@) and DeltaG^(@) for the reaction. [Given: E_(Ag^(+)//Ag)^(@) =+0.80 V, E_(Zn^(2+)//Zn)^(@) =-0.76 V]

(a) What type of a battery is the lead storage battery ? Write the anode and the cathode reactions and the overall occuring in a lead storage battery when current is drawn from it. (b) In the buttom cell, widely used in watches the following reaction take place Zn_((s)) + Ag_(2)O_((l)) rarr Zn^(2+)(aq) + 2Ag_((s)) + 2OH_((aq))^(-) . Determine E^(@) and DeltaG^(@) for the reaction. (given : E_(Ag^(+)//Ag)^(@) = +0.80 V , E_(Zn^(2+)//Zn)^(@) = - 0.76 V)

Knowledge Check

  • A buttonn cell used in watches function as following Zn(s) +Ag_(2)O(s) +H_(2)O(l) rarr 2Ag(s)+Zn^(2+)(aq)+2OG^(-)(aq), E^(@)=0.34 V the cell potential will be

    A
    1.10 V
    B
    0.42 V
    C
    0.84 V
    D
    1.34 v

  • Consider Delta G^(@) for the following cell reaction : Zn (s) + Ag_(2)O(s)+H_(2)O(l) hArr Zn^(2+)(aq)+2Ag(s)+2OH^(-)(aq) E_(Ag^(+)//Ag)^(@) = +0.80 and E_(Zn^(2+)//Zn)^(@) = - 0.76 V

    A
    `-305 kJ//mol`
    B
    `-301 kJ//mol`
    C
    `+305kJ//mol`
    D
    `+301kJ//mol`

  • Delta_rG^@ for the cell with the cell reaction : Zn_((s))+ Ag_2O_((s)) + H_2O_((l)) to Zn_((aq))^(2+) + 2Ag_((s)) + 2OH_((aq))^(-) [E_(Ag_2O // Ag)^(@)=0.344 V, E_(Zn^(2+)//Zn)^@=-0.76 V]

    A
    `2.13xx10^5 "J mol"^(-1)`
    B
    `-2.13xx10^5 "J mol"^(-1)`
    C
    `1.06xx10^5 "J mol"^(-1)`
    D
    `-1.06xx10^5 "J mol"^(-1)`

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