﻿ Calculate the equilibrium constant of reaction at 25°C:Ni(s) + Cu2+ (aq) → Cu(s) + Ni2+ (aq)Given : E°Ni2+/Ni = -0.25 V, E°Cu2+/Cu = + 0.34 V, R = 8.314 J K–1 mol–1, F = 96500 C mol–1. from Chemistry Electrochemistry Class 12 Nagaland Board

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Calculate the equilibrium constant of reaction at 25°C:
Ni(s) + Cu2+ (aq) → Cu(s) + Ni2+ (aq)
Given : E°Ni2+/Ni = -0.25 V, E°Cu2+/Cu = + 0.34 V, R = 8.314 J K–1 mol–1, F = 96500 C mol–1.

We have given
E°Ni2+/Ni = -0.25 V
Cu2+/Cu = + 0.34 V,

Ecell
0 =

${\mathrm{E}}_{\mathrm{cell}}^{0}$ =
0.34-(-0.25)

${\mathrm{E}}_{\mathrm{cell}}^{0}$
= 0.34+0.25 =0.59

R = 8.314 J K–1 mol–1
F = 96500 C mol–1.
T=25celcius =273+25 =298 Kelvin
n= 2

= Antilog[19.956]

Ans.  9.07 x 1019

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Calculate the emf of the cell in which the following reaction takes place:
Ni(s) + 2Ag+ (0.002 M) $\to$ Ni2+ (0.160 M) + 2Ag(s)
Given that

$\mathrm{Ni}\left(\mathrm{s}\right)+2{\mathrm{Ag}}^{+}\left(\mathrm{aq}\right)\to {\mathrm{Ni}}^{2+}\left(\mathrm{aq}\right)+2\mathrm{As}\left(\mathrm{s}\right)$

or

The equation is also written as

or

= 1.05 V – 0.0295 x log 80

= 1.05 V – 0.0295 x 1.9031

= 1.05 V – 0.056 = 0.99 V.

1585 Views

Calculate the potential of hydrogen electrode in contact with a solution whose pH is 10.

For hydrogen electrode, ,
given that      pH = 10
use formula [H+] = 10–pH
so that  [H+] = 10−10 M
Electrode reaction will
H+  + e –  →1/2 H2
Use the formula

1279 Views

Can you store copper sulphate solutions in a Zinc pot?

No. Because zinc is more reactive than copper and thus holes will be developed in zinc pot.

Cu2+(aq) + Zn(s) → Zn2+ (aq) + Cu(s)
1384 Views

How would you determine the standard electrode potential of the system Mg2+/Mg?

Use standard hydrogen electrode as anode and Mg2+ | Mg as a cathode we can measure the standard electrodepotential of systemMg2+ | Mg. Standard hydrogen electrode, represented by Pt(s), H2(g) (1 atm) | H+ (aq) and dip the electrode of Magnesium wire in a 1M MgSO4 solution .The standard hydrogen electrode is always zero.
Use formula
Eocell = Eo right  – Eoleft
The standard hydrogen electrode is always zero.
So that the value of
Eoleft =0
Hence
Eocell = Eo Mg|Mg2+
Or
Eo Mg|Mg2+= Eocell
2203 Views

Consult the table of standard electrode potentials and suggest three substance that can oxidize ferrous ions under suitable conditions.