ElectrochemistryHard

Question

Zinc granules are added in excess to a 500 ml of 1.0 M nickel nitrate solution at 25°C until the equilibrium is reached. If the standard reduction potential of Zn2+|Zn and Ni2+|Ni are − 0.75 V and −0.24 V, respectively, the concentration of Ni2+ in solution at equilibrium is (2.303 RT/F = 0.06)

Options

A.1.0 × 10−17 M
B.1.0 × 1017 M
C.5 × 10−17 M
D.2 × 10−17 M

Solution

$Zn + Ni^{2 +} \rightleftharpoons Zn^{2 +} + Ni$

$E_{cell}^{o} = \frac{0.06}{2}.\log K_{eq}$

⇒ (–0.24) – (–0.75) = 0.03 log Keq

∴ Keq = 1017 ⇒ It means that Ni2+ will react almost completely and [Zn2+] ≈ 1.0 M

Now, $10^{17} = \frac{1.0}{\left\lbrack Ni^{2 +} \right\rbrack} \Rightarrow \left\lbrack Ni^{2 +} \right\rbrack = 10^{- 17}\text{ M}$

Create a free account to view solution

View Solution Free
Topic: Electrochemistry·Practice all Electrochemistry questions

More Electrochemistry Questions

The standard emf of the cell, Cd(s) | CdCl2(aq) (0.1 M) || AgCl(s) | Ag(s) in which the cell reaction is,Cd(s) + 2AgCl(s...The Gibbs energy for the decomposition of Al2O3 at 500oC is as follows : Al2O3 → Al + O2, ᐃrG = + 966 kJ mol...Cost of electricity for the production of ′X′ litre H2 at NTP at cathode is Rs. X, then cost of electricity ...The oxidation states of iodine in HIO4, H3IO5 and H5IO6 are respectively...The Gibbs energy for the decomposition of Al2O3 at 500oC is as follows: 2/3 Al2O3 → 4/3 Al + O2 ; ᐃrG = + 96...