Acid Orange 7

{{Chembox

| verifiedrevid = 477240679

| ImageFile = 2-naphthol orange.svg

| ImageAlt = Skeletal formula of acid orange 7

| ImageFile1 = Acid-orange-7-sodium-3D-balls.png

| ImageSize1 = 230

| ImageAlt1 = Ball-and-stick model of the component ions of acid orange 7

| IUPACName = sodium 4-[(2E)-2-(2-oxonaphthalen-1-ylidene)hydrazinyl]benzenesulfonate

| OtherNames = 2-naphthol orange, Orange II, CI 15510, D&C Orange 4, COLIPA C015

|Section1={{Chembox Identifiers

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

| ChemSpiderID = 21171709

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

| UNII = Q1LIY3BO0U

| InChI = 1/C16H12N2O4S.Na/c19-15-10-5-11-3-1-2-4-14(11)16(15)18-17-12-6-8-13(9-7-12)23(20,21)22;/h1-10,19H,(H,20,21,22);/q;+1/p-1

| InChIKey = CQPFMGBJSMSXLP-REWHXWOFAS

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

| StdInChI = 1S/C16H12N2O4S.Na/c19-15-10-5-11-3-1-2-4-14(11)16(15)18-17-12-6-8-13(9-7-12)23(20,21)22;/h1-10,19H,(H,20,21,22);/q;+1/p-1

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

| StdInChIKey = CQPFMGBJSMSXLP-UHFFFAOYSA-M

| CASNo_Ref = {{cascite|correct|CAS}}

| CASNo = 633-96-5

| PubChem = 23682006

| SMILES = [Na+].[O-]S(=O)(=O)c1ccc(cc1)N=Nc2c3ccccc3ccc2O

}}

|Section2={{Chembox Properties

| Formula = C₁₆H₁₁N₂NaO₄S (sodium salt)

| MolarMass = 350.32 g/mol

| Appearance =

| Density = 1.525 g/cm³

| MeltingPt = 164 °C

| BoilingPt =

| Solubility =

}}

|Section3={{Chembox Hazards

| MainHazards =

| FlashPt =

| AutoignitionPt =

}}

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Acid Orange 7, also known as 2-naphthol orange is an azo dye. It is used for dyeing wool.