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CGP EDU Academic Team
Published on: August 11, 2026
Write the definition of specific rotation
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Specific rotation is the number of degrees of rotation observed if a 1-dm (10-cm) tube is used and the compound has concentration 1gm/mL.Thus specific rotation [ α ] is
= 
Where, [ α ] = Specific rotation; θ = observed angle of rotation (degree)
λ = Pathlength (dm); C = concentration (gm/ml)
λ = wavelength (nm); t = temperature (25°C)
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