copper(II) arsenate

{{distinguish|Copper arsenite}}

{{chembox

| Watchedfields = changed

| verifiedrevid = 443420181

| ImageFile = Copper(II)-arsenate-constituent-ions-2D.png

| ImageSize =

| IUPACName = Copper(II) arsenate

| OtherNames = Copper arsenate

|Section1={{Chembox Identifiers

| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}

| ChemSpiderID = 24279

| InChI = 1/2AsH3O4.3Cu/c2*2-1(3,4)5;;;/h2*(H3,2,3,4,5);;;/q;;3*+2/p-6

| InChIKey = RKYSWCFUYJGIQA-CYFPFDDLAM

| SMILES = [Cu+2].[Cu+2].[Cu+2].[O-][As]([O-])(=O)[O-].[O-][As]([O-])([O-])=O

| StdInChI_Ref = {{stdinchicite|correct|chemspider}}

| StdInChI = 1S/2AsH3O4.3Cu/c2*2-1(3,4)5;;;/h2*(H3,2,3,4,5);;;/q;;3*+2/p-6

| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}

| StdInChIKey = RKYSWCFUYJGIQA-UHFFFAOYSA-H

| CASNo = 7778-41-8

| CASNo_Ref = {{cascite|correct|??}}

| UNII_Ref = {{fdacite|correct|FDA}}

| UNII = EV78GZO3YS

| PubChem = 26065

| RTECS =

}}

|Section2={{Chembox Properties

| Formula = Cu₃(AsO₄)₂

| MolarMass = 468.48 g/mol

| Appearance = blue or bluish green powder

| Density = 5.2 g/cm³

| MeltingPtC = 1100

| BoilingPt =

| Solubility = insoluble

| SolubleOther = soluble in ammonia, dilute acids

| SolubilityProduct = 7.95{{e|−36}}{{cite book |author1=John Rumble |title=CRC Handbook of Chemistry and Physics |date=June 18, 2018 |publisher=CRC Press |isbn=978-1138561632 |pages=5–188|edition=99 |language=English}}

}}

|Section7={{Chembox Hazards

| FlashPt =

| PEL = TWA 1 mg/m³ (as Cu){{PGCH|0150}}

| REL = TWA 1 mg/m³ (as Cu)

| IDLH = TWA 100 mg/m³ (as Cu)

}}

|Section8={{Chembox Related

| OtherAnions =

| OtherCations =

}}

}}

Copper arsenate (Cu₃(AsO₄)₂·4H₂O, or Cu₅H₂(AsO₄)₄·2H₂O), also called copper orthoarsenate, tricopper arsenate, cupric arsenate, or tricopper orthoarsenate, is a blue or bluish-green powder insoluble in water and alcohol and soluble in aqueous ammonium and dilute acids.