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Polarimeters are so sensitive that they can measure
rotationsto the thousandth of a degree, an important advantage when
onlysmall amounts of a sample are available. For example, when
7.00mgof ecdysone, an insect hormone that controls molting in
thesilkworm moth, was dissolved in 1.00 ml of choloroform in a
cellwith a 2.00 cm path length, an observed rotation
of+0.087o was found. Calculate [a]d
forecdysone.

Respuesta :

Giangiglia

Answer:

[tex][\alpha ]=62.1[/tex]

Explanation:

The equation to calculate the specific rotation ([tex][\alpha ][/tex]) of a substance is:

[tex][\alpha ]=\frac{\alpha}{c*l}[/tex]

Where:

  • [tex]\alpha[/tex] is the optical rotation
  • [tex]c[/tex] is the concentration in g/ml
  • [tex]l[/tex] is the path length in dm

In this case:

[tex]l=2 cm=0.2dm[/tex]

[tex]c=\frac{0.007 g}{ml}[/tex]

[tex]\alpha=0.087[/tex]

The specific rotation:

[tex][\alpha ]=\frac{0.087}{0.007*0.2}=62.1[/tex]

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