Chemistry · May / June 2024 · Paper 62 · Question 4
0620
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Bismuth is a metal that has a reactivity similar to that of copper. The ore bismite contains the compound bismuth(III) oxide, Bi2O3. Bismuth(III) oxide is insoluble in water and reacts with dilute acids to form an aqueous solution of a salt. The ore bismite contains no other compounds that are insoluble in water and no other compounds that react with acids to form aqueous solutions. Describe how you could obtain a sample of bismuth metal starting with a large lump of the ore bismite. You have access to common laboratory apparatus and chemicals. [6]
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any 6 from
MP1 crush the ore / lumps / powder the ore / lumps / make the ore / lumps into smaller pieces
MP2 using a suitable method e.g. pestle and / or mortar, hammer
MP3 adds water (stirs) and filters
then either:
displacement in solid state method
MP4 add more reactive element / suitable reducing agent (to residue / ore)
MP5 identified as carbon / coke / iron / zinc / aluminium / magnesium / hydrogen / CO / ammonia / (subsumes MP4) MP6 heat (the ore or Bi2O3) (to form bismuth)
MP7 bismuth displaced / reduced or bismuth formed by displacement
OR
electrolysis method
MP4 adds suitable named (A correct formula) strong acid (to residue / ore) R adding acid to filtrate
MP5 electrolysis (of solution)
MP6 using inert electrodes / C or Pt electrodes
MP7 bismuth forms at cathode
OR
displacement from aqueous solution
MP4 adds suitable named strong acid (to residue / ore) R adding acid to filtrate
MP5 add more reactive metal
MP6 suitable more reactive metal identified (and added to solution of salt) (subsumes MP5) (e.g. Zn, Fe, Mg, Al but not K, Na, Ca)
MP7 bismuth displaced / reduced or bismuth formed by displacement
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