Problem: A mixture of molten salts, NaCl, MgBr2 and LiI undergoes electrolysis. Which species would you predict would form first at the cathode and at the cathode?1) Li formed at the anode, F2 formed at the cathode.2) Li formed at the cathode, F2 formed at the anode.3) Mg formed at cathode, I2 formed at the anode.4) Mg formed at anode, I2 formed at the cathode.

FREE Expert Solution

We’re being asked to predict what would form first at the cathode and at the cathode when NaCl, MgBr2, and LiI undergo electrolysis.


Recall that the cathode is where reduction occurs while the anode is where oxidation occurs.


Since NaCl, MgBr2, and LiI are ionic compounds, the will form ions when molten

Sodium is from Group 1A, it has a charge of +1. The chloride ion, Cl, has a charge of –1:

NaCl  Na+ + Cl

Magnesium is from Group 2A, it has a charge of +2. The bromide ion, Br, has a charge of –1:

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Problem Details

A mixture of molten salts, NaCl, MgBr2 and LiI undergoes electrolysis. Which species would you predict would form first at the cathode and at the cathode?

1) Li formed at the anode, F2 formed at the cathode.

2) Li formed at the cathode, F2 formed at the anode.

3) Mg formed at cathode, I2 formed at the anode.

4) Mg formed at anode, I2 formed at the cathode.

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Electrolysis of Water & Mixture of Ions concept. If you need more Electrolysis of Water & Mixture of Ions practice, you can also practice Electrolysis of Water & Mixture of Ions practice problems.