Reactions of halides with concentrated H2SO4

• What is the chemical formula for sulfuric acid?

  H2SO4
• What happens when concentrated sulfuric acid is added to sodium halides?

  It produces steamy fumes and reacts.
• What are the observations when NaCl and NaF react with concentrated sulfuric acid?

  • Both produce steamy white fumes.
  • NaF produces hydrogen fluoride (HF).
  • NaCl produces hydrogen chloride (HCl)
  • both are acid base reactions .
• Write the equation for the reaction of sodium fluoride with sulfuric acid.

  NaF + H2SO4 → NaHSO4 + HF
• Write the equation for the reaction of sodium chloride with sulfuric acid.

  NaCl + H2SO4 → NaHSO4 + HCl
• How does sulfuric acid act as an acid in these reactions?

  It donates protons (H+) to bases.
• Why are the reactions with sulfuric acid not classified as redox reactions?

  There are no changes in oxidation states as they’re both reducing agents.
• What happens when solid NaBr reacts with concentrated sulfuric acid?

  • Produces colourless choking gas as SO2 ion (reduction of H2SO4)
  • Produces steamy white fumes as hydrogen bromide (HBr) gas.(acid-base reaction)
  • Br2 producing orange fumes. (Oxidation of Br ion)
• Write the equation for the reaction of sodium bromide with sulfuric acid.

  NaBr + H2SO4 → NaHSO4 + HBr

  OR

  2NaBr + 2H2SO4 —> 2NAHSO4 +2H2O + Br2
• What are the observations when solid NaI reacts with concentrated sulfuric acid?

  • Produces steamy white fumes Of HI (acid-base reaction)
  • Produces black solid and purple gas of I2 (oxidation of I ion).
  • Produces yellow solid S (reduction of H2SO4)
  • produced colourless choking gas of SO2 ion (reduction of H2SO4)
  • smells of bad eggs of H2S (reduction of H2SO4)
• Write the equation for the reaction of sodium iodide with sulfuric acid.

  NaI + H2SO4 → NaHSO4 + HI
• What gas is produced when NaI reacts with sulfuric acid?

  Hydrogen sulfide (H2S)
• What is the type of reaction when sodium halides react with sulfuric acid?

  Acid-base reaction
• What are the products of the reaction between NaI and concentrated sulfuric acid?

  • Sodium hydrogen sulfate (NaHSO4)
  • Hydrogen iodide (HI)
  • Iodine (I2)
  • Hydrogen sulfide (H2S)