Question

Molten magnesium bromide was electrolyzed using graphite electrodes.
a) Explain why solid magnesium bromide does not conduct electricity but conducts when in molten state. ( 2 marks)
b) Give the formulas of two ions, including their charges, present in molten magnesium bromide. ( 2 marks)
c) Write an equation for the reaction at the cathode. ( 2 marks)
d) Is the reaction at the cathode oxidation or reduction? Give a reason for your answer. ( 2 marks)

Answer 1

Answer:

a) because it is an ionic solid

b)Mg2+ and Br2-

c)Mg²^+ + 2e- ------> Mg

d) reaction in cathode is always oxidation because electrons from current source passes only through cathode to get oxidation of products