:TAPSO

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| verifiedrevid = 449646558

| ImageFile = TAPSO.svg

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| IUPACName = 3-[[1,3-dihydroxy-2-(hydroxymethyl)propan-2-yl]amino]-2-hydroxypropane-1-sulfonic acid

| OtherNames = 3-[N-Tris(hydroxymethyl)methylamino]-2-hydroxypropanesulfonic acid

|Section1={{Chembox Identifiers

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

| CASNo = 68399-81-5

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

| UNII = 45Q4J0071U

| PubChem = 109334

| ChemSpiderID_Ref = {{chemspidercite|changed|chemspider}}

| ChemSpiderID = 98301

| SMILES = O=S(=O)(O)CC(O)CNC(CO)(CO)CO

| InChI = 1/C7H17NO7S/c9-3-7(4-10,5-11)8-1-6(12)2-16(13,14)15/h6,8-12H,1-5H2,(H,13,14,15)

| InChIKey = RZQXOGQSPBYUKH-UHFFFAOYAF

| StdInChI_Ref = {{stdinchicite|changed|chemspider}}

| StdInChI = 1S/C7H17NO7S/c9-3-7(4-10,5-11)8-1-6(12)2-16(13,14)15/h6,8-12H,1-5H2,(H,13,14,15)

| StdInChIKey_Ref = {{stdinchicite|changed|chemspider}}

| StdInChIKey = RZQXOGQSPBYUKH-UHFFFAOYSA-N}}

|Section2={{Chembox Properties

| Formula = C₇H₁₇NO₇S

| MolarMass = 259.28 g/mol

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|Section3={{Chembox Hazards

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TAPSO is used to make buffer solutions. It has a pK_a value of 7.635 (I=0, 25°C).{{cite journal |title=Thermodynamic Quantities for the Ionization Reactions of Buffers |last=Goldberg |first=R. |author2=Kishore, N. |author3=Lennen, R. |journal=J. Phys. Chem. Ref. Data |volume=31 |pages=231–370 |year=2002 |issue=2 |url=https://www.nist.gov/data/PDFfiles/jpcrd615.pdf |doi=10.1063/1.1416902 |access-date=2017-07-13 |archive-date=2008-10-06 |archive-url=https://web.archive.org/web/20081006062140/https://www.nist.gov/data/PDFfiles/jpcrd615.pdf |url-status=dead }} It can be used to make buffer solutions in the pH range 7.0-8.2.