Question
Download Solution PDFA 20 cm long tube containing 15% sugar solution rotates the plane of polarization of light by 21°. The specific rotation of sugar solution is:
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
A polarimeter consists of a light source, two polarizing prisms or filters, a liquid cell placed between the two polarizers, an eyepiece and a protractor for measuring the angular rotation of light by the solution.
Specific rotation α:
\(\alpha = \frac{\theta }{{lc}}\)
θ = measured rotation in angular degrees, c = concentration in grams per millilitre of solution, l = cell length in decimetres
Calculation:
20 cm = 2 decimetres
\(\alpha = \frac{\theta }{{lc}} = \frac{{21}}{{2 \times 0.15}} = 70^\circ \)Last updated on Jun 19, 2025
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