Calcium

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Calcium
Chemical formula	Ca
Atomic Number	20
OTP appearance	solid
Molar Mass(g/mol)	40.1
Density(g/cc)	1.55
Melting Point(°C)	842
Boiling Point(°C)	1484
NFPA 704	1 3 2 W

Elemental Calcium is rarely required. Normally it is used in a reduced state.

Uses

Justification Questioned

Many calcium compounds are used in this experiment

Natural occurrence

Elemental calcium does not occur naturally
Calcium carbonate is a major component of the minerals calcite, chalk and limestone
Calcium phosphate and calcium carbonate are major components of bone and shell

Production

Extraction

Electrolysis of calcium chloride

Produce calcium chloride from calcium ores by combining them with hydrochloric acid
CaCO₃ + 2 HCl → CaCl₂ + H₂O
Electrolyze at 775°C, 100V
CaCl₂
{
→
775°C 100V}
Ca + Cl₂

From halides

by halide stripping with sodium^[1]
CaI₂ + 2 Na → 2 NaI + Ca

See Also

References

↑ Mellor, Joseph William (1912) "Modern Inorganic Chemistry"
Longmans, Green, and Co

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