A chiral sample gives a rotation that is close to 180°.

How can...

Question

A chiral sample gives a rotation that is close to 180°.

How can one tell whether this rotation is +180° or -180°?

Accepted Answer

Hey everyone. Let's solve this problem and says the solution of a Cairo molecule gives a rotation about 179.9 degrees. Propose a way to tell if the rotation is plus 1 80 degrees or minus 1 degrees. Well, let's look at the equation for the rotation observed. We have the rotation observed equal specific rotation times concentration times path length. Right? I just rearranged the specific rotation equation, so notice how this value. The observed rotation depends on concentration. So if our sample is too close to 180° to tell which direction, if we measure the rotation of a diluted sample. well, it will decrease the rotation of the solution, but it will have the same size. Or sorry, the same sign of our original solution. So the correct answer is C measure the rotation of the diluted sample solution. That's it for this problem. I hope this is helpful. And thanks for watching.

A chiral sample gives a rotation that is close to 180°. How can one tell whether this rotation is +180° or -180°?

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