TES (buffer)

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TES (buffer)
TES free acid.svg
IUPAC name
2-[[1,3-dihydroxy-2-(hydroxymethyl)propan-2-yl]amino]ethanesulfonic acid
Other names
TES free acid
3D model (Jmol)
ECHA InfoCard 100.028.097
Molar mass 229.25 g/mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

TES is used to make buffer solutions. It has a pKa value of 7.550 (I=0, 25°C).[1] It is one of the Good's buffers and can be used to make buffer solutions in the pH range 6.8–8.2. It is one of the components of Test yolk buffer medium used for refrigeration of semen and transport.


  1. ^ Goldberg, R.; Kishore, N.; Lennen, R. (2002). "Thermodynamic Quantities for the Ionization Reactions of Buffers" (PDF). J. Phys. Chem. Ref. Data. 31: 231–370. doi:10.1063/1.1416902.