4. The turbidity of a natural rubber solution in toluene at 343 K was determined before (1) and after (2) its thermal aging for 18 days (table). To determine how the molecular weight of the rubber changes during aging.
C, kg/m3 1.0 1.5 2.0 2.5 3.0
Turbidity of solution T*108
1) 3.18 3.30 3.50 3.72 3.76
2) 1.65 1.95 2.03 2.22 2.2 24

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