Question

The limiting molar ionic conductivities for Mg2+ and Cl- are 0.0106 Ω-1 mol-1 m2 and 0.0076 Ω-1 mol-1 m2 respectively.

a) Calculate the limiting molar conductivity of an MgCl2 solution (2 marks).

b) Calculate the ionic mobility (2 marks), ionic conductivity (2 marks) and transport number (2 marks) for the magnesium and chloride ions in a 0.01 M MgCl2 solution.

c) What electric field strength would produce a current density of 1 mA cm-2 for this 0.01 M solution of MgCl2 (2 marks)?

d) Provide a graph of the molar conductivity vs. concentration that shows the trends for a strong, intermediate and weak electrolyte (3 marks). What is Khalraush’s law and which electrolyte would fit this law best (2 marks)?

Answer 1