39(1). To control the composition of the mixture in the production of cellulose triacetate, consisting of benzene, acetic acid and acetic anhydride, the absorption of acetic acid was measured at 1.92 μm of standard mixtures at different cuvette thicknesses (l, mm), and different mass fractions of % acetic acid ( w,%) and got:
l,mm 1.00 2.00 3.00 4.00
w1=10.0% 28.5 34.5 38.0 40.5
w2=30.0% 35.0 45.0 53.5 57.0
w3=40.0% 38.0 50.5 61.5 62.0
Select the thickness of the cuvette (l, mm), which ensures maximum sensitivity of the analysis, and determine the mass fraction (%) of acetic acid in the mixture if the following instrument readings are obtained at lx 1) 42.5% 2) 51.0% 3) 58.0 %
Neglect the absorption of other components of the mixture.

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