218. Specific rotation of the plane of polarization for sucrose is determined by the formula
α20D = 66.56 8*10-4С – 2*10-4С2,
Where
C – concentration, g/100 ml.
Determine the angle of rotation of the plane of polarization of a solution containing 2.8 g of sucrose in 50 ml of water, if the length of the tube is 30 cm.

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