Reaction of Halide Ions Flashcards
(18 cards)
Why do halide ions become better reducing agents down Group 7?
They become better reducing agents because the IONS ARE LARGER, so their OUTER ELECTRONS ARE FURTHER FROM THE NUCLEUS and LESS STRONGLY ATTRACTED, making them EASIER TO LOSE
What happens to a halide ion when it acts as a reducing agent?
It loses an electron and becomes a halogen molecule
What is the trend in reducing ability of halide ions down Group 7?
Reducing ability increases down the group (F⁻ < Cl⁻ < Br⁻ < I⁻)
Why does reducing ability increase down Group 7?
This is because larger ions lose electrons more easily due to increased distance from the nucleus and greater shielding
Why is the outer electron in iodide (I⁻) more easily lost than in fluoride (F-)?
Iodide has more electron shells, so the outer electron is further from the nucleus and experiences less attraction
What happens when solid sodium chloride (NaCl) reacts with concentrated sulfuric acid (H2SO4)?
Steamy fumes of hydrogen chlorine (HCL) are produced and solid sodium hydrogen sulfate (NAHSO4) is formed
Is the reaction between sodium chloride and concentrated sulfuric acid a redox reaction? Why or why not?
No, it’t not a redox reaction because there is no change in oxidation states
What are the initial products when sodium bromide (NaCl) reacted concentrated sulfuric acid (H2SO4)?
What type of reaction is this?
Steamy fumes of hydrogen bromide (HBr) and solid sodium hydrogen sulfate (NaHSO4)
Acid Base Reaction
What type of reaction occurs. between sodium chloride and concentrated sulfuric acid?
Acid - base reactions
What additional products are observed when sodium bromide (NaBr) reacts with concentrated sulfuric acid?
Brown fumes of bromine (Br2) and colourless sulfur dioxide (SO2)
What type of reactions occurs after HBr is formed in the reaction with sodium bromide?
A redox reaction where bromide ions reduce sulfuric acid
Why does sulfuric acid act as an oxidising agent in the reaction with sodium bromide?
This is because bromide ions are strong enough reducing agents to reduce sulfuric acid to sulfur dioxide
What are observable products when sodium iodide reacts with concentrated sulfuric acid?
Steamy fumes of hydrogen iodide (HI), black solid iodine (I2), yellow sulfur (S), colourless sulfur dioxide (SO2) and hydrogen sulfide gas (H2S) with a bad egg smell
What are the three possible reduction products of sulfuric acid in the reaction with iodide?
Sulfur dioxide (SO2), sulfur (S) and hydrogen sulfide (H2S)
