Problem: The following reactions (note that the arrows are pointing only one direction) can be used to prepare an activity series for the halogens:Br2(aq) + 2NaI(aq)  →  2NaBr(aq) + I2(aq)Cl2(aq) + 2NaBr(aq)  →  2NaCl(aq) + Br2(aq)Which elemental halogen would you predict is the most stable, upon mixing with other halides?

FREE Expert Solution

Br2(aq) + 2NaI(aq)  →  2NaBr(aq) + I2(aq)

The above equation shows that bromine is capable of displacing iodine from its compound.  

That means that bromine is more reactive than iodine.

Cl2(aq) + 2NaBr(aq)  →  2NaCl(aq) + Br2(aq)

The second equation shows that chlorine is capable of displacing bromine from its compound.  

That means that chlorine is more reactive than bromine.

The activity series of these three elements would show them in the order of decreasing reactivity from top to bottom as follows:

chlorine

bromine

iodine

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Problem Details

The following reactions (note that the arrows are pointing only one direction) can be used to prepare an activity series for the halogens:
Br2(aq) + 2NaI(aq)  →  2NaBr(aq) + I2(aq)
Cl2(aq) + 2NaBr(aq)  →  2NaCl(aq) + Br2(aq)

Which elemental halogen would you predict is the most stable, upon mixing with other halides?

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Our tutors have indicated that to solve this problem you will need to apply the Activity Series concept. You can view video lessons to learn Activity Series. Or if you need more Activity Series practice, you can also practice Activity Series practice problems.