7. When measuring the viscosity of 1,4 cis-polyisoprene solutions in toluene using a capillary viscometer, the following data were obtained:
s, g/l 0 1.41 1.94 2.59 3.24 3.89
Solution flow time τ, s 171.5 216.1 234.0 257.3 282.6 308.1
Calculate the values ​​of relative, specific and reduced viscosity of the solutions. Plot a graph of the dependence ηsp/s = f (c) and determine the intrinsic viscosity [η] and the Huggins viscometric constant K/.

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