4.2.3 - Reactions of halides with sulfuric acid Flashcards
What is oxidising power?
How well something oxidises other substances.
What is reducing power?
How well something reduces other substances
Compare the oxidising power of mg2+ and Mg+
Mg2+ stronger as gains electrons more easily to be reduced.
What happens to oxidising power as you ascend group 7?
Increases
F takes electrons from other elements so oxidises them
What happens to reducing power of halides as you descend group 7?
Increases
F- doesn’t give electrons away easily and so no other elements receive electrons from it.
At- gives e away as its big so weak attraction
Is sulfuric acid a reducing or oxidising agent?
Oxidising agent.
Often gets reduced
Does cl- reduce H2SO4?
no
True or false
Not all group 7 elements form acidic hydrides?
true
Sulfuric acid is an oxidising agent so is reduced. What are 3 products that it can be reduced to?
Sulfur dioxide
Sulfur
Hydrogen sulfide
What products are formed when sodium chloride reacts with concentrated sulfuric acid?
And what observations can be made from these products?
Hydrogen chloride (misty fumes)
What products are formed when sodium bromide reacts with concentrated sulfuric acid?
And what observations can be made from these products?
Hydrogen bromide (misty fumes)
Bromine (brown fumes)
Sulfur dioxide (colourless gas with choking smell)
What products are formed when sodium Iodide reacts with concentrated sulfuric acid?
And what observations can be made from these products?
Hydrogen iodide (misty fumes)
Iodine (purple fumes or black solid)
Sulfur dioxide (colourless gas with choking smell)
Sulfur (yellow solid)
Hydrogen sulfide (colourless has with rotten egg smell)
Why do bromide ions cause sulfuric acid to be reduced but not chloride ions?
Bromide ions have a greater reducing power.
