Q4 of 33 Page 73

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

Given:

For hydrogen electrode, pH = 10


n = 1


(n = moles of e- from balanced redox reaction)


On using the formula [H+] = 10– pH


⇒ [H+] = 10 − 10 M


We know,



Here, E0 = 0


P[H2] = 1


⇒


⇒


⇒


⇒


⇒


More from this chapter

All 33 →
2

Can you store copper sulphate solutions in a zinc pot?

 3

Consult the table of standard electrode potentials and suggest three substances that can oxidise ferrous ions under suitable conditions

 5

Calculate the emf of the cell in which the following reaction takes place:

Ni(S) + 2Ag+ (0.002M) → Ni2+ (0.160 M) + 2Ag(s)


Given that

6

The Cell in which the following reaction occurs:

2Fe3+(aq) + 2I– (aq) → 2Fe2+(aq) + I2(s) has E0cell = 0.236V at 298 K.


Calculate the standard Gibbs energy and the equilibrium constant of the cell reaction.