Halogens

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What is a displacement reaction?
Halogen reacts with halide; halogen then replaces less reactive halide in the compound
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What is the reaction with sodium chloride and sulphuric acid?
NaCl + H2SO4 ------------ NaHSO4 + HCl
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What is observed in the sodium chloride reaction?
Steamy fumes
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What is the reaction with sodium bromide and sulphuric acid?
NaBr + H2SO4 ------------ NaHSO4 + HBr
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What is observed in the sodium bromide reaction?
Steamy fumes; Brown fumes
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What is the reaction with sodium iodide and sulphuric acid?
NaI + H2SO4 ---------- NaHSO4 + HI
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What is the ionic equation for sodium iodide in sulphuric acid?
8H+ + 8I- + H2SO4 ---------- H2S + 4H2O + 4I2
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What is observed in the Sodium iodide reaction?
Yellow solid (sulphur); Bad eggy smell (H2S); Black solid (iodine); Steamy fumes (HI)
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How does one identify metal Halide ions?
HNO3 added to Halide solution to get ride of soluble carbonate or hydroxide impurities; Silver nitrate solution added = Halide precipitate forms; We can then identify halide due to colour formed and by adding ammonia
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What is the ionic equation for sodium bromide?
2H+ + 2Br + H2SO4 ----------- SO2 + 2H2O + Br2
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What is the reaction of chlorine with water? What is it used for?
Cl2 + H2O ---------- HCLO + HCl (Used as bleach + Kills bacteria in drinking water)
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What is disproportionation?
Oxidation state increases in one species but decreases in the other
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What is the reaction with sunlight and Chlorine + water?
2Cl2 + H2O ------------ 4HCl + O2
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What is the alternative to direct chlorination involving sodium?
NaClO + H2O ------------ NA+ + OH- + HClO
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What is the reaction with Chlorine and an Alkali?
Cl2 + 2NaOH --------------- NAClO + NaCl + H2O
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Card 2

Front

What is the reaction with sodium chloride and sulphuric acid?

Back

NaCl + H2SO4 ------------ NaHSO4 + HCl

Card 3

Front

What is observed in the sodium chloride reaction?

Back

Preview of the front of card 3

Card 4

Front

What is the reaction with sodium bromide and sulphuric acid?

Back

Preview of the front of card 4

Card 5

Front

What is observed in the sodium bromide reaction?

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