Evaluate yourself - with Solutions

Evaluate yourself : 1

Calculate the molar conductance of 0.01M aqueous KCl solution at 25º C . The specific conductance of KCl at 25ºC is 14.114 Ã—10- 2 Sm-1 .

Evaluate yourself : 2

The resistance of 0.15N solution of an electrolyte is 50 Ω. The specific conductance of the solution is 2.4 Sm-1. The resistance of 0.5 N solution of the same electrolyte measured using the same conductivity cell is 480 Ω. Find the equivalent conductivity of 0.5 N solution of the electrolyte.

Given that

R1=50Ω

R2= 480Ω

κ1  = 2.4 Sm-1

κ2 = ?

N1 = 0.15 N

N2 = 0.5 N

Evaluate yourself

1. The emf of the following cell at 25º C is equal to 0.34v. Calculate the reduction potential of copper electrode.

Pt (s) | H2 (g, 1atm) | H+ (aq, 1M) || Cu2+ (aq, 1M) | Cu (s)

2. Using the calculated emf value of zinc and copper electrode, calculate the emf of the following cell at 25º C .

Zn (s) | Zn2+ (aq, 1M) || Cu2+ (aq, 1M) | Cu (s)

Evaluate yourself

Write the overall redox reaction which takes place in the galvanic cell,

Pt(s) | Fe2+ (aq),Fe3+ (aq) || MnO-4 (aq), H+ (aq),Mn2+ (aq) | Pt(s)

Evaluate yourself

The electrochemical cell reaction of the Daniel cell is

Zn (s) + Cu2+ (aq) â†’ Zn2+ (aq)+Cu (s)

What is the change in the cell voltage on increasing the ion concentration in the anode compartment by a factor 10?

Evaluate yourself A solution of a salt of metal was electrolysed for 15 minutes with a current of 0.15 amperes. The mass of the metal deposited at the cathode is 0.783g. calculate the equivalent mass of the metal.