Basic copper carbonate

Basic copper carbonate

Names
IUPAC name Dicopper carbonate dihydroxide
Other names copper carbonate hydroxide, cupric carbonate, copper carbonate
Identifiers
CAS Number	12069-69-1 N
3D model (Jmol)	Interactive image
ChemSpider	23796
ECHA InfoCard	100.013.338
PubChem	25503
InChI InChI=1S/CH2O3.2Cu.2H2O/c2-1(3)4;;;;/h(H2,2,3,4);;;2*1H2/q;2*+2;;/p-4 Key: ZMMDPCMYTCRWFF-UHFFFAOYSA-J InChI=1/CH2O3.2Cu.2H2O/c2-1(3)4;;;;/h(H2,2,3,4);;;2*1H2/q;2*+2;;/p-4 Key: ZMMDPCMYTCRWFF-XBHQNQODAP
SMILES C(=O)([O-])[O-].[OH-].[OH-].[Cu+2].[Cu+2]
Properties
Chemical formula	Cu2(OH)2CO3
Molar mass	221.116 g/mol
Appearance	green powder
Density	4 g/cm3
Melting point	200 °C (392 °F; 473 K)
Boiling point	290 °C (554 °F; 563 K) decomposes
Solubility in water	insoluble
Solubility product (Ksp)	7.08·10−9
Thermochemistry
Std molar entropy (So298)	88 J/mol·K
Std enthalpy of formation (ΔfHo298)	−595 kJ/mol
Hazards
Safety data sheet	Oxford MSDS
GHS pictograms
GHS signal word	Warning
GHS hazard statements	H302, H315, H319, H335
GHS precautionary statements	P261, P305+351+338
EU classification (DSD)	Xn
R-phrases	R22, R36/37/38
S-phrases	S26, S36
Lethal dose or concentration (LD, LC):
LD50 (median dose)	159 mg/kg (rat, oral)
US health exposure limits (NIOSH):
PEL (Permissible)	TWA 1 mg/m3 (as Cu)
REL (Recommended)	TWA 1 mg/m3 (as Cu)
IDLH (Immediate danger)	TWA 100 mg/m3 (as Cu)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N  (what is YN ?)
Infobox references

Basic copper carbonate is a chemical compound, more properly called copper(II) carbonate hydroxide. It is an ionic compound (a salt) consisting of the ions copper(II) Cu2+
, carbonate CO2−
3, and hydroxide HO−
.

The name most commonly refers to the compound with formula Cu
2CO
3(OH)₂. It is a green crystalline solid that occurs in nature as the mineral malachite. It has been used since antiquity as a pigment, and it is still used as such in artist paints, sometimes called vertiter, green bice, or mountain green.

Sometimes the name is used for Cu
3(CO
3)₂(OH)₂, a blue crystalline solid also known as the mineral azurite. It too has been used as pigment, sometimes under the name mountain blue or blue verditer.

Both malachite and azurite can be found in the verdigris patina that is found on weathered brass, bronze, and copper. The composition of the patina can vary, in a maritime environment depending on the environment a basic chloride may be present, in an urban environment basic sulfates may be present.