1. Tardigrade
  2. Question
  3. Physics
  4. Specific rotation of sugar solution is O.5 deg kg. 200 kgm-3 of impure sugar solution is taken in a sample polarimeter tube of length 20 cm and optical rotation is found to be 19?. The percentage of purity of sugar is

Question Error Report

Thank you for reporting, we will resolve it shortly

Back to Question

Q. Specific rotation of sugar solution is O.5 deg kg. 200 kgm-3 of impure sugar solution is taken in a sample polarimeter tube of length 20 cm and optical rotation is found to be 19?. The percentage of purity of sugar is

MGIMS WardhaMGIMS Wardha 2008

Solution:

The strength of solution is given by x $ c=\frac{\theta }{l\times s} $ . where the symbols have their usual meanings. Here, $ \theta =19{}^\circ ,\text{ }l=20\text{ }cm=0.20m, $ $ s=0.5\,\deg \,{{m}^{2}}/kg. $ $ \therefore $ $ c=\frac{19}{0.20\times 0.5}=190kg-{{m}^{-3}} $ The sugar sample dissolved in a $ {{m}^{3}} $ of water is 200 kg in which 190 kg is pure sugar. Therefore, purity is $ =\frac{190}{200}\times 100 $ $ =95% $