I need help with a chemistry question about plane polarised light?
Suppose you have a sample of sucrose that appears to rotate plane polarised light 90 degrees dextrorotatory. How would you know for sure that the solution is not rotating the plane polarised light by 270 degrees levorotary?
Answers:
Change the concentration slightly, and measure again. You will see where a slightly lower concentration will rotate the light, and thereby be able to say whether it's 90° dextro- or 270° levorotary.
Even rotating by 90 degrees is a HUGE amount. No solution rotates by this much, let alone 270 degrees.
Random guess but shine the light through less of the solution and see which way it goes?
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Answers:
Change the concentration slightly, and measure again. You will see where a slightly lower concentration will rotate the light, and thereby be able to say whether it's 90° dextro- or 270° levorotary.
Even rotating by 90 degrees is a HUGE amount. No solution rotates by this much, let alone 270 degrees.
Random guess but shine the light through less of the solution and see which way it goes?
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