8C.3 Reactions of halides with sulfuric acid Flashcards
what is the half equation for the reduction of an halide ion
2X^- —–> X2 + 2e^-
what happens when sulfuric acid is very concentrated
it would contain a few ions in which it can undergo partial ionization
what is the partial ionization of H2SO4
H2SO4 ⇌ HSO4^- + H^+
where does the equilibrium lie in the partial ionization of H2SO4 and why
to the left, because the more concentrated the acid is the less water there is so the more likely partial ionization would occur
what is the second partial ionization that occurs in the sulfuric acid
HSO4^- ⇌ H^+ + SO4^-2
sulfuric acid especially when concentrated can act like an
oxidizing agent
what are the 3 possible products of the reduction of sulfuric acid and their half equations
S: H2SO4 + 6H^+ + 6e^- ———-> 4H2O + S
SO2: H2SO4 + 2H^+ + 2e^- ———–> 2H2O + SO2
H2S: H2SO4 + 8H^+ + 8e^- ————-> 4H2O + H2S
what are the observations made in NaCl reaction with concentrated sulfuric acid and what product is responsible for
Misty fume = HCl
what are the observations made in NaBr reaction with concentrated sulfuric acid and what product is responsible for
Misty fumes = HBr
Brown fumes = Br2
A colourless gas with chocking smell = SO2
what are the observations made in NaI reaction with concentrated sulfuric acid and what product is responsible for
Misty fumes = HI
Purple fumes or a black solid = I2
A colorless gas with a choking smell = SO2
A yellow solid = S
A colourless gas with a rotten egg smell = H2S
does sulfuric acid act as an oxidizing agent with Cl
No, only as an acid since Cl has week reducing powers but it acts like that with both I and Br
what is the reaction of NaCl + H2SO4
NaCl + H2SO4 ———> NaHSO4 + HCl
what is the reaction between NaBr and H2SO4 to form a brown misty fume of Br
2HBr + H2SO4 ——–> 2H2O + SO2 + Br2
how do you construct an equation to form a purple mist of I
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