Dynamic and static light scattering experiments have been performed at room temperature on sodium alginate ( ( M ) , = 1.9 X lo6) in the concentration range 0.2-2 g/L and in the ionic strength range 4.4-95 mM. By the introduction of a simple method based on the Schwarz inequality we have (1) compared various moments for the distribution of the radius of gyration and of the molecular weight, (2) obtained the value 10 f 6 nm for the Kuhn statistical segment, and (3) obtained from both diffusion and viscosity measurements values for equivalent-sphere parameters, which, within large errors, are in agreement with predictions by the Kirkwood-Riseman theory. Interaction properties as reflected in the values for virial coefficients and in the shapes of the photon correlation functions are discussed. Volume ABSTRACT: Angular scattering functions, P ( p ) , have been computed for subchains located in the middle and at the end of a polymethylene chain. The rotational isomeric state model developed by Flory and co-workers