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Identify Gas K and Gas F. Write equations for the reactions in the roasting furnace and absorption tower.

Chemistry

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Step 1: Identify Gas K and Gas F.

  • Gas K: In the roasting furnace, copper pyrites (CuFeS2\text{CuFeS}_2) are heated in air, converting sulfides to oxides and releasing sulfur dioxide gas. 2CuFeS2(s)+4O2(g)⟶Cu2S(s)+2FeO(s)+3SO2(g)2\text{CuFeS}_2\text{(s)} + 4\text{O}_2\text{(g)} \longrightarrow \text{Cu}_2\text{S}\text{(s)} + 2\text{FeO}\text{(s)} + 3\text{SO}_2\text{(g)} Therefore, Gas K is sulfur dioxide.
  • Gas F: Gas F is produced in Chamber W (the converter), where matte (Cu2S\text{Cu}_2\text{S}) is converted to blister copper. This process also releases sulfur dioxide. 2Cu2S(l)+3O2(g)⟶2Cu2O(l)+2SO2(g)2\text{Cu}_2\text{S}\text{(l)} + 3\text{O}_2\text{(g)} \longrightarrow 2\text{Cu}_2\text{O}\text{(l)} + 2\text{SO}_2\text{(g)} 2Cu2O(l)+Cu2S(l)⟶6Cu(l)+SO2(g)2\text{Cu}_2\text{O}\text{(l)} + \text{Cu}_2\text{S}\text{(l)} \longrightarrow 6\text{Cu}\text{(l)} + \text{SO}_2\text{(g)} Therefore, Gas F is sulfur dioxide.

Part a(i)

Gas K: SO2\boxed{\text{SO}_2}

Identify

Part a(ii)· 1 step

Gas F: SO2\boxed{\text{SO}_2}

  1. Write equations for the reactions in the roasting furnace and absorption tower.

    • i) Roasting furnace: Copper pyrites (CuFeS2\text{CuFeS}_2) are roasted in air. 2CuFeS2(s)+4O2(g)⟶Cu2S(s)+2FeO(s)+3SO2(g)2\text{CuFeS}_2\text{(s)} + 4\text{O}_2\text{(g)} \longrightarrow \text{Cu}_2\text{S}\text{(s)} + 2\text{FeO}\text{(s)} + 3\text{SO}_2\text{(g)}
    • ii) Absorption tower: In the absorption tower, sulfur trioxide (Gas C) reacts with concentrated sulfuric acid to form oleum (Compound T). SO3(g)+H2SO4(l)⟶H2S2O7(l)\text{SO}_3\text{(g)} + \text{H}_2\text{SO}_4\text{(l)} \longrightarrow \text{H}_2\text{S}_2\text{O}_7\text{(l)}

Part b(i)

Roasting furnace

Write equations for the reactions that takes place in the

$$
\boxed{2\text{CuFeS}_2\text{(s)} + 4\text{O}_2\text{(g)} \longrightarrow \text{Cu}_2\text{S}\text{(s)} + 2\text{FeO}\text{(s)} + 3\text{SO}_2\text{(g)}}
$$

Part b(ii)· 1 step

Absorption tower

$$
\boxed{\text{SO}_3\text{(g)} + \text{H}_2\text{SO}_4\text{(l)} \longrightarrow \text{H}_2\text{S}_2\text{O}_7\text{(l)}}
$$

  1. Write the formula of the cation present in slag M.

    • Slag M is formed in the smelting furnace when iron(II) oxide (FeO\text{FeO}) reacts with silica (SiO2\text{SiO}_2) to form iron(II) silicate (FeSiO3\text{FeSiO}_3). FeO(s)+SiO2(s)⟶FeSiO3(l)\text{FeO}\text{(s)} + \text{SiO}_2\text{(s)} \longrightarrow \text{FeSiO}_3\text{(l)}
    • In iron(II) silicate, the iron is in the +2 oxidation state.

Part c

Write the formula of the cation present in the slag M

Fe2+\boxed{\text{Fe}^{2+}}
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