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Help with specific rotation calculations

  1. Feb 23, 2010 #1
    Help with specific rotation calculations (urgent)

    1. The problem statement, all variables and given/known data

    I need help determining a sugar in solution based on the specicific rotation i gained through the required calculation this was done at 589nm


    2. Relevant equations

    [α] = σ/cl

    3. The attempt at a solution
    Solution A Solution B Solution C
    589nm +2.004 +4.034 -4.434
    578nm +2.004 +4.034 -4.438
    546nm +2.350 +4.576 -4.995
    436nm +3.924 +7.578 -8.195
    365nm +6.000 +11.469 -12.280
    were the polarimeter readings

    the calculations done for specific rotation were as followings
    [α]λT = σ/cl where σ:eek:ptical rotation measured,
    c: concentration w/v - 0.05
    λ:wavelength measured at
    T:Temperature of the sample when measured – 30.05
    L:length of pathway for light – 1cm
    Solution A: 589 & 578nm - +2.004/(0.5)(0.1)= 40.08
    546nm - +2.350/(0.5)(0.1) = 47
    436nm - +3.924/(0.5)(0.1) = 78.48
    365nm - +6.000/(0.5)(0.1) = 120
    Solution B: 589 & 578nm - +4.034/(0.5)(0.1) = 80.68
    546nm - +4.576/(0.5)(0.1) = 91.52
    436nm - +7.578/(0.5)(0.1) = 151.56
    365nm – +11.469/(0.5)(0.1) =229.38
    Solution C: 589nm - -4.434/(0.5)(0.1) = -88.68
    578nm - -4.438/(0.5)(0.1) = -88.76
    546nm - -4.995/(0.5)(0.1) = -99.9
    436nm - -8.195/(0.5)(0.1) = -163.9
    365nm - -12.280/(0.5)(0.1)= -245.6
    Having been trying to find the specific rotation online or in a crc handbook to determine the type of sugar in each solution.Does anyone know where i can find such information
     
    Last edited: Feb 23, 2010
  2. jcsd
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