Removing impurities using Na2CO3

*jsmith613*

1. The problem statement, all variables and given/known data

Why is the answer D??

2. Relevant equations
3. The attempt at a solution
So I know that Na₂CO₃ is used to remove excess acid but surely only HBr is the acid?

Borek

SO₂ is an acid anhydride, so there would be nothing strange in the fact it reacts with a basic solution. However, there is more to it. Bromine is a strong oxidizing agent, and in the alkaline solution it can easily oxidize sulfite (known reducing agent) to something much more stable.

*jsmith613*

Quote by Borek

SO₂ is an acid anhydride, so there would be nothing strange in the fact it reacts with a basic solution. However, there is more to it. Bromine is a strong oxidizing agent, and in the alkaline solution it can easily oxidize sulfite (known reducing agent) to something much more stable.

but the conditions are acidic?

Borek

During reaction, but we are talking about purification of a distilled product, don't we?

*jsmith613*

Quote by Borek

During reaction, but we are talking about purification of a distilled product, don't we?

oh so it has been seperate from acid
and therefore the sodium carbonate is the base? right?

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jsmith613	Removing impurities using Na2CO3 Tweet 1. The problem statement, all variables and given/known data Why is the answer D?? 2. Relevant equations 3. The attempt at a solution So I know that Na₂CO₃ is used to remove excess acid but surely only HBr is the acid?

Borek Admin	SO₂ is an acid anhydride, so there would be nothing strange in the fact it reacts with a basic solution. However, there is more to it. Bromine is a strong oxidizing agent, and in the alkaline solution it can easily oxidize sulfite (known reducing agent) to something much more stable.

Borek Admin	Removing impurities using Na2CO3 During reaction, but we are talking about purification of a distilled product, don't we?