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Below is a set of apparatus that was used to obtain a dry sample of sulphur(iv)oxide gas
ChemForm4Term1OpPP2Q6

  1. Name;
    • Solid W 
    • The apparatus containing dilute hydrochloric acid 
  2. State the role of Liquid Y 
  3. Complete the diagram to show how the gas could have been collected 
  4. A sample of sulphur(iv)oxide gas was passed through freshly prepared iron(III)sulphate solution. State and explain the observation made 
  5. 50cm3 of 2M Hydrochloric acid was used during the above experiment. Determine the volume of sulphur(iv)oxide gas produced at r.t.p (molar gas volume = 24dm3

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  1.   
    • Sodium sulphite
    • Dropping funnel
  2. Drying agent

  3. ChemForm4Term1OpPP2A6C
  4. Yellow  iron (III) sulphate  solution turned pale green sulphur (IV) oxide gas reduced iron (III) ions to iron (II) ions
  5.    
    • Na2SO3(S) + 2HCl(aq) → 2 NaCl(aq)+SO2(g) + H2O(l)
      moles of HCl
      2 moles  → 1000 cm3
      50 cm3
      (2×50)/1000=100/1000 = 0.1moles
      Mole ratio Hcl : SO2
                           2 : 1 
      Moles of SO2 = 1/2= 0.05moles
      1Mole → 24dm3
      moles ? = 1.2dm3
      2(0.05×24)/
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