Determination of intrinsic viscosity from one point measurement

The method of calculation of the intrinsic viscosity [η] from one viscosity measurement according to the Solomon and Ciutǎ's equation\documentclass{article}\pagestyle{empty}\begin{document}$$ \begin{array}{l} [\eta ]c = \sqrt 2 \sqrt {\eta _{sp} - \ln \eta _r } \\ \\ \end{array} $$\end{document} has been analysed. The difference between [η] extrapolated from the measurement of viscosity at several concentrations and [η] calculated has been defined in dependence on the product [η] c and the value of Huggins' constant k' . It has been demonstrated that the proposed equation is often useful but not generally valid; the range of its applicability has been defined.