1) The specific rotation, [] D , for (-)-malic acid is - 27 . What is the observ
ID: 910495 • Letter: 1
Question
1) The specific rotation, []D, for (-)-malic acid is -27. What is the observed rotation for a solution of 1.5 g of (-)-malic acid in 10 mL of water in a sample tube having a pathlength of 10 cm?
2)
The observed rotation of a solution of 1.7 g of a compound in 10 mL of water is +5.8 degrees. If the pathlength is 10 cm, what is the specific rotation of the compound?
3)The observed rotation of a solution of 0.66 g of a compound in 10 mL of water is -5.3 degrees. If the pathlength is 10 cm, what is the specific rotation of the compound?
Explanation / Answer
1-[]lT = /lc
=[]lT x lc = -27 x 1dm x0.15 g/ml = -4.05 degrees
2- []lT = /lc = +5.8 /1 dm x 0.17g/ml =+34.117 degrees
3- []lT = /lc = -5.3 /1dm x 0.066g/ml = - 80.3030 degrees
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