TAPS (buffer) explained

TAPS ([tris(hydroxymethyl)methylamino]propanesulfonic acid) is a chemical compound commonly used to make buffer solutions.

It can bind divalent cations, including Co(II) and Ni(II).[1]

TAPS is effective to make buffer solutions in the pH range 7.7–9.1, since it has a pKa value of 8.44 (ionic strength I = 0, 25 °C).[2]

The pH (and pKa at I ≠ 0) of the buffer solution changes with concentration and temperature, and this effect may be predicted e.g. using online calculators.[3]

Notes and References

  1. Machado . Carina M. M. . Gameiro . Paula . Soares . Helena M. V. M. . . 2008 . 37 . 5 . 603–617 . Complexation of M - (buffer)x - (OH)y systems involving divalent ions (cobalt or nickel) and zwitterionic biological buffers (AMPSO, DIPSO, TAPS and TAPSO) in aqueous solution . 10.1007/s10953-008-9265-3. 97906177 .
  2. Thermodynamic quantities for the ionization reactions of buffers . Goldberg . Robert N. . Nand . Kishore . Rebecca M. . Lennen . . 31 . 2 . 231–370 . 2002 . 10.1063/1.1416902 .
  3. Web site: Biological buffers . REACH Devices.

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