Chlorine

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Chlorine
Chemical formula Cl
Atomic Number 17 
OTP appearance yellowish gas 
Molar Mass(g/mol) 35.45 
Melting Point(°C) -101.5 
Boiling Point(°C) -34.04 
Density(g/cc) 0.0032 
Solubility in water(g/L) 4-10 
Immediate Danger to Life and Health 10ppm (inh)
NFPA 704
NFPA704.png
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OX

Chlorine is the only element that is also an industrial chemical.

Uses

Primary

Secondary

Natural Sources

Hazards

Chlorine (like fluorine and bromine) is very toxic

Production

Synthesis

Purification

Testing

test strip

  1. Mix 20ubm water, 0.1ubm starch and 0.5ubm potassium iodide
  2. soak paper in this solution, wring out/press
  3. Expose the strip to the chlorine gas
  4. Strip color change: goes from light beige/tan (starch) to inky (blur/violet/black) on exposure to chlorine gas.

Storage

  • Toxic!
  • Store in airtight, watertight glass / PTFE vessel

Disposal

  • Bubble through double molar solution of sodium, potassium or calcium hydroxide, producing the salt and the hypochlorite. This is exothermic!
    Cl2 + 2 NaOH(aq) NaCl(aq) + NaOCl(aq) + H2O + heat

See Also

References