Monday, March 2, 2020

1. Preparation of Potassium Tetracyanonickelate(II)

  1. 14.5 grams nickel chloride hydrate + 7 grams KCN in 100 mL water. The ppt of nickel(II) cyanide is filtered off and washed. 
    1. 2.07 grams nickel chloride hydrate in 10 mL boiling water + 1 grams KCN in 10 mL water
  2. The ppt is then mixed with 10 mL of water to form a slurry.
  3. To the slurry is added 7 grams of KCN in 15 mL water.
  4. The solution is then evaporated down until crystals begin to form. The solution is then chilled in ice. 

Sunday, March 1, 2020

1. Preparation of Thorium Hydroxide

  1. Vial #1 of Thorium Hydroxide
    1. Mass (vial+lid+ThO2) = 20.37g 
    2. Emission = ~3.10 μSv/hr
  2. First Th(OH)4 Preparation
    1. ​​​​​​​Mass (vial+lid+ThO2) after transfer of thorium hydroxide to beaker = 11.48 grams
    2. Mass of thorium dioxide = 8.89 grams
    3. Number of moles thorium dioxide = 0.0336691410 moles
      1. ​​​​​​​Molar mass of thorium dioxide = 264.04 grams / mole
    4. ​​​​​​​Theoretical yield of thorium hydroxide = 10.10 grams
      1. ​​​​​​​Molar mass of thorium hydroxide = 300.07
  3. ​​​​​​​​​​​​​​Preparation
    1. ​​​​​​​The white thorium dioxide powder was transferred into a 250 mL beaker. ~60 mL of 88% sulfuric acid was added to the beaker and it was heated.
    2. It was found that the thorium dioxide solidified at the bottom of the beaker. With difficulty the solid mass is broken up with a glass rod.
    3. Addition of water seemed to create a large solid mass as the slurry cooled. 
    4. More sulfuric acid was added and then more water until the total volume was ~250 mLs. 
    5. The slurry was stirred via a magnetic stir bar over heat for about half an hour
    6. The heat was turned off while stirring was allowed to continue.
    7. The slurry was transferred to a 1 liter flask and water was added until the total volume was ~500 mL.
  4. Molten Potassium Bisulfate Experiment
    1. ​​​​​​​1.7 grams of thorium dioxide was transferred to a 50 mL porcelain crucible
      1. ​​​​​​​Total mass of vial+cap+thorium dioxide after removal of material for experiment = 9.78 grams​​​​​​​

Friday, February 28, 2020

1. Mercury(II) Cyanide Synthesis

  1. 7.3 g KOH + 14.4 g HgO in 100 mL of water
    1. 1.3 g KOH +2.56 HgO in 17.81 mL of water
  2. ​​​​​​​HgO Vial Weight = 27.13 grams 
  3. Inorganic Laboratory Preparations pages 47-48

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