Copper (II) oxide: Difference between revisions

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(Created page with "{{Compound|aka=cupric oxide, black copper oxide|chemf=CuO|group=salts |mm=79.545|density=6.315|mp=1326|bp=2000|sol_aq=0 |stp_p=powder|stp_q=black |nfpa_h=2|nfpa_r=1}} ==Uses==...")
 
 
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===Synthesis===
===Synthesis===
{{Reaction
Heating [[copper]] to 300°C in air produces CuO.
| name=Oxidation of copper
| in=copper + air
| out=copper (II) oxide
| t=300°C
}}
* Heating [[copper]] to 300°C in air produces CuO.
# Gather 100ubm of fine [[copper]] grains
# Gather 100ubm of fine [[copper]] grains
# Heat over a flame in a shallow thin-walled crucible
# Heat over a flame in a shallow thin-walled crucible

Latest revision as of 11:54, 23 March 2020

 
Copper (II) oxide
aka cupric oxide, black copper oxide
Chemical formula CuO
OTP appearance black powder 
Molar Mass(g/mol) 79.545 
Density(g/cc) 6.315 
Melting Point(°C) 1326 
Boiling Point(°C) 2000 
Solubility in water(g/L) 0
NFPA 704
NFPA704.png
0
2
1
 

Uses

Primary

Other

  • Catalyst
  • Precursor to cuperammonium for the production of rayon
  • Glass polishing
  • Component of copper-aluminum thermite
  • P-type semiconductor

Natural occurrence

  • Occurs naturally as the rare mineral tenorite

Hazards

Production

Extraction

Synthesis

Heating copper to 300°C in air produces CuO.

  1. Gather 100ubm of fine copper grains
  2. Heat over a flame in a shallow thin-walled crucible
  3. Repeat
    1. Stir the grains over a steady, strong heat until they become a uniform dark grey or black
      NB: the stirring is vital, or the copper oxide "crust" will prevent air from reaching the inner mass of copper, and solidify the entire mass into a single lump which will be hard to manipulate
    2. Grind filings thoroughly in a mortar and pestle
      NB: this is to crack off any CuO "skin", exposing new copper on the surface of the grain
    3. Weigh the filings.
  4. Until filings weigh close to 125ubm (Cu: ~64g/mol, CuO ~80g/mol
  5. The filings are predominantly copper (II) oxide
As an example, 325mesh (44μm) copper powder will accumulate 10% weight in about 30 minutes in a crucible on a gas stove. The coarser the powder, the smaller the surface area, thus the less oxygen can react with the powder, and the less mass it can gain.

See Also

References