Topic: how to find the ratio of enatiomers in a mixture (Read 2261 times)

sarkar · « **on:** September 03, 2014, 02:50:32 PM »

A dextrorotatory isomer has a specific rotation of +51.3 ° at30°C . A sample containing both isomers has specific rotation value +30.8° at 20°C.
What is the percentage of the two enantiomers in the sample?

rwiew · « **Reply #1 on:** September 03, 2014, 11:57:35 PM »

We'll need to see some attempts from you. What's the formula for enantiomeric excess, specific rotation of a mixture?

Enthalpy · « **Reply #2 on:** September 04, 2014, 03:54:03 PM »

Intuitively, this should need the concentrations in both samples. If not, the second sample could be just more dilute.

rwiew · « **Reply #3 on:** September 04, 2014, 10:08:30 PM »

Quote from: Enthalpy on September 04, 2014, 03:54:03 PM

Intuitively, this should need the concentrations in both samples. If not, the second sample could be just more dilute.

Nope, they are specific rotations = per unit concentration.

Enthalpy · « **Reply #4 on:** September 05, 2014, 11:55:38 AM »

Thanks!

Topic: how to find the ratio of enatiomers in a mixture (Read 2261 times)

sarkar

how to find the ratio of enatiomers in a mixture

rwiew

Re: how to find the ratio of enatiomers in a mixture

Enthalpy

Re: how to find the ratio of enatiomers in a mixture

rwiew

Re: how to find the ratio of enatiomers in a mixture

Enthalpy

Re: how to find the ratio of enatiomers in a mixture

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