optical rotation in enantiomers

[ihatebluescrubs]

When we have two compounds that are enantiomers of each other like: If I'm given one rotation to be +x, can I assume the opposite enantiomer will be -x?

I was reading points 4 and 5 here (http://academics.keene.edu/rblatchly/OrgoCommon/hand/stereochem/Connect.html)

and they seem to contradict?: "Enantiomers have identical properties, except With respect to plane-polarized light"

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[Jepstein30]

When we have two compounds that are enantiomers of each other like: If I'm given one rotation to be +x, can I assume the opposite enantiomer will be -x?

I was reading points 4 and 5 here (http://academics.keene.edu/rblatchly/OrgoCommon/hand/stereochem/Connect.html)

and they seem to contradict?: "Enantiomers have identical properties, except With respect to plane-polarized light"

Yep, exactly.

You don't know WHICH enantiomer will rotate + or - but if you are given that one enantiomer rotates +, you know the other rotates -.

4 and 5 don't contradict.. rotating optical light is the different property with respect plane polarized light that they are referring to