Electrochemistry

Calculate the equilibrium constant for the reaction:
2Fe3+ + 3I- \(\leftrightharpoons\) 2Fe2+ + \(I_3^-\). The standard reduction potentials in acidic conditions are 0.78 V and 0.54 V respectively for Fe3+ | Fe2+ and \(I_3^-\) | I- couples.

How many grams of silver could be plated out on a serving tray by electrolysis of a solution containing silver in +1 oxidation state for a period of 8.0 hours at a current of 8.46 amperes? What is the area of the tray if the thickness of th...

Calculate the equilibrium constant for the reaction
Fe2+ + Ce4+ \(\leftrightharpoons\) Fe3+ + Ce3+
(given \(E_{C{e^{4 + }}/C{e^{3 + }}}^o\) = 1.44 V; \(E_{F{e^{3 + }}/F{e^{2 + }}}^o\) = 0.68 V)

The standard reduction potential for Cu2+|Cu is +0.34 V. Calculate the reduction potential at pH = 14 for the above couple. Ksp of Cu(OH)2 is 1.0 \(\times\) 10-19

An excess of liquid mercury is added to an acidified solution of 1.0 \(\times\) 10-3 M Fe3+. It is found that 5% of Fe3+ remains at equilibrium at 25oC. Calculate \(E_{Hg_2^{2 + }|\,Hg}^o\), assuming that only reaction that occurs is
2Hg + ...

The Edison storage cells is represented as
Fe(s) | FeO(s) | KOH (aq) | Ni2O3(s) | Ni(s)
The half-cell reactions are:
Ni2O3 + H2O (l) + 2e- \(\leftrightharpoons\) 2NiO(s) + 2OH-; Eo = +0.40V
FeO(s) + H2O(l) + 2e- \(\leftrightharpoons\) Fe(s)...

The standard reduction potential of the Ag+/Ag electrode at 298 K is 0.799V. Given that for AgI, Ksp = 8.7 \(\times\) 10-17, evaluate the potential of the Ag+/Ag electrode in a saturated solution of AgI. Also calculate the standard reductio...

Chromium metal can be plated out from an acidic solution containing CrO3 according to the following equation
CrO3 (aq) + 6H+ (aq) + 6e- \(\to\) Cr(s) + 3H2O
Calculate (i) how many grams of chromium will be plated out by 24,000 coulombs and...

The standard reduction potential for the half-cell
\(NO_3^-\) + 2H+ (aq) + e \(\to\) NO2 (g) + H2O is 0.78 V
(i) Calculate the reduction potential in 8 M H+
(ii) What will be the reduction potential of the half-cell in a neutral solution? A...

An aqueous solution of NaCl on electrolysis gives H2(g), Cl2(g) and NaOH according to the reaction:
2Cl- (aq) + 2H2O = 2OH- (aq) + H2 (g) + Cl2 (g)
A direct current of 25 amperes with a current efficiency of 62 % is passed through 20 litres...

For the galvanic cell
Ag | AgCl(s), KCl (0.2M) || KBr (0.001M), AgBr(s) | Ag
Calculate the EMF generated and assign correct polarity to each electrode for a spontaneous process after taking into account the cell reaction at 25oC.
[Ksp(AgCl)...

The current of 1.70 A is passed through 300.0 ml of 0.160 M solution of a ZnSO4 for 230 sec. with a current efficiency of 90%. Find out the molarity of Zn2+ after the deposition of Zn. Assume the volume of the solution to remain constant du...

Zinc granules are added in excess to a 500 ml. of 1.0 M nickel nitrate solution at 25oC 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, find out the conc...

(i) What is the weight of sodium bromate and molarity pf solution necessary to prepare 85.5 ml of 0.672 B solution when the half-cell reaction is
\(BrO_3^- + 6H^+ + 6e^- \to\) \(Br^- + 3H_2O\)
(ii) What would be the weight as well as mola...