124. Задачка по химии №012 476

119. An experiment on the effect of temperature on swelling was carried out by placing a sample of dry gelatin weighing 1.09 g in water at two different temperatures. The following data on the increase in the mass of the sample over time were obtained:
t, min mass of sample m, g

0 50 100 150 200 250
T= 291 K 1.09 7.14 11.55 14.66 16.46 16.90
T=318K 2.05 21.52 37.43 19;48 1.15 —
Plot swelling kinetic curves and determine the type of swelling. Determine if gelatin is lyophilic or lyophobic with respect to water.
1. How does the temperature and nature of the solvent affect the type of swelling?
2. In what cases does limited and unlimited swelling occur? Give examples.

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