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Specific rotation

  • Thread starter pseudogirl
  • Start date
  • #1
Why is specific rotation not a colligative property?
i just read that it depends on concentration(gm/litre)
but i feel that it should depend on molarity considering the fact that rotation is due to changes in molecular structure....do i have a point or am i just being silly ...can someone help me?
 
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Answers and Replies

  • #2
Borek
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Looks to me like you are confusing rotation with specific rotation.
 
  • #3
i am sorry .i did confuse them both
so does rotation depend on number of moles per liter?


this is the formula in the book

specific rotation=rotation/l*c


l=length of polarimeter tube
c=concentration of optically active solution in (gm/l)


why is molarity not there in the formula?
 
  • #4
Borek
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28,399
2,800
so does rotation depend on number of moles per liter?
Yes.

c=concentration of optically active solution in (gm/l)

why is molarity not there in the formula?
Does it have to be there? Concentration in the definition is expressed in g/L, g/L and molarity are easily interconvertible.
 

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