2. To determine the composition of aqueous solutions of propanol, the refractive indices of the standard solutions given below were determined:
Propanol content, % 0 10 20 30 40
Refractive indices 1.3333 1.3431 1.3523 1.3591 1.3672
Build a calibration graph and determine the content of propanol in solutions whose refractive index is 1.3470 and 1.3615.
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