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Chemistry LibreTexts

14.7: Vanadium Rainbow Prep

  • Page ID
    209457
  • Materials
    • 30 – 50 mL Erlenmeyer flasks
    • Cotton balls – Can be placed in the hood
    • 10 hot plates
    • 10 stir bars
    • plastic pipets – Can be placed in the hood

     

    Chemicals

    Prepare 5 sets  

    • 2L – 0.1 M ammonium vanadate in 1 M H2SO4 
    • small jar of zinc dust 
    • small jar of silver dust 
    • small jar of tin dust 
    • 500 mL – 1 M nitric acid 
    • 500 mL – 0.1 M potassium nitrite 
    • 500 mL – 0.1 M sodium bromide 
    • 500 mL – 0.2 M sodium chlorate 

     

    Directions 

    To make the ammonium vanadate solution, Add 200 mL of DI water to 2 L volumetric flask, then add 110 mL of concentrated H2SO4. Caution: This will get extremely warm. Add 23.40 g of solid and mix while warm. Add remaining water. It may take a while to completely dissolve the ammonium vanadate, but it will eventually all go into solution.

     

    Waste bottle needed.

     

    SDS Info
    • Ammonium Vanadate – Skull and crossbones – toxic if swallowed; Exclamation point – eye irritant; Health hazard – harmful if inhaled; Exclamation point – may cause respiratory irritation; Health hazard – Causes damage to organs with prolonged exposure or if swallowed; Environmental – aquatic toxicity
    • Sulfuric Acid – Corrosion – Skin corrosion/burns; Corrosion – eye damage; Corrosion – Corrosive to metals
    • Zinc powder – Environmental – aquatic toxicity
    • Silver powder – Environmental – aquatic toxicity
    • Tin – Exclamation point – eye irritant; Exclamation point – respiratory tract irritant
    • Nitric Acid – Corrosion – skin corrosion/burns; Corrosion – eye damage; Corrosion – corrosive to metals; Flame over Circle – oxidizer; Skull and crossbones – toxic if inhaled
    • Potassium Nitrite –Flame over circle – oxidizer; Environmental – aquatic toxicity; Skull and crossbones – toxic if swallowed
    • Sodium Bromide – None
    • Sodium Chlorate –Exclamation point – harmful if swallowed; Flame over circle – oxidizer; Environmental – aquatic toxicity
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