http://www.figge-fencl.org/titrationcurve.html
:
A least-squares linear regression fit to the Figge-Fencl quantitative physicochemical model (version 3.0) over the pH range of 6.90 to 7.90 yields the following equation for the charge displayed by albumin:
[ Albx- ] = -10 x [ Albumin ] x ( 0.123 x pH - 0.631 );
where [ Albx- ] is in mEq / L and [ Albumin ] is in g / dL. Therefore, at pH 7.40, the charge contributed by 4.40 g / dL of albumin is approximately -12.3 mEq / L.