reducing power group 7

Why does reducing ability of halogens increase down the group

atomic radius increases, greater tendency to donate electron, easier to loose electron as outer electron goes further away from positive nucleus

why is fluoride and chloride reactions with H2SO4 acid base and not redox

Reducing power is too low to reduce sulfur in sulphuric acid

show reaction between NaF and H2SO4 and state how you know a gas is produced

NaF + H2SO4 → NaHSO4 + HF (white steamy fumes)

Bromide has a higher reducing power so is able to

reduce sulfur in sulfuric acid to sulfur dioxide

how do you know HBr is produced

Brown steamy fumes

Show reaction between HBr and H2SO4

2HBr + H2SO4 → Br2 + 2H2O + SO2

Iodide is the …

strongest reducing agent

Show reaction between 2HI and H2SO4 + state how you know iodine is produced

2HI + H2SO4 → SO2 + 2H2O + I2

black solid and purple fumes

How do you know SO2 is produced

colourless acidic gas

Show reaction between 6HI and H2SO4 + state how you know sulfur is produced

6HI + H2SO4 → 3I2 + S + 4H2O

Yellow solid produced

Show reaction between 8HI and H2SO4 + state how you know h2s is produced

8HI + H2SO4 → H2S + 4I2 + 4H2O

gas and bad egg smell

How can you test for production of SO2 gas

damp blue litmus paper which will turn red