Posted by Hannah on Sunday, October 28, 2012 at 3:02pm.
I'm not understanding. You know the formula; substitute the numbers and solve for alpha.
Oh ok, the question asks me to find the specific rotation for D-erythrose 4-phosphate which I determined was 50 and then it asks me to find the specific optical rotation for L-erythrose 4-phosphate so I thought that it would be a different formula.
The path of length was given in cm so I converted it to dm but I am not sure if I calculated the concentration correctly. A 50 gram sample was dissolved in 10 mL solution so would I do 50/10?
Yes, path length is in dm and cncn is g/mL. In your case that is 50g/10 mL = 5 g/mL.
ok thank you and for the specific rotation of L-erythrose 4-phosphate would it be the same as for D-erythrose 4-phosphate which I determined was 50 or would it be -50?
If one is + the optical isomer will be - but don't confuse D and L with d and l.
d is for dextro-rotatory(right handed) and l is for levo-rotatory(left handed) and they don't have anything to do with D- and L-.
Here is a LONG article where you can read more.
http://en.wikipedia.org/wiki/Chirality_%28chemistry%29
Related Questions
Chemistry - If the specific rotation of Compound X is (-) 123.8º, what ...
ochem lab - What is the expected observed rotation of a 9.1 x 10-5 M solution of...
Chemistry - Organic chemistry: an attempt at synthesizing a certain optically ...
Organic Chemistry - how to calculate specific observed rotation?
Chemistry - Suppose a student is measuring the optical rotation of a 1 M sample ...
Chemistry - A pure sample of (R)-limonene has a specific rotation of +125.6. If ...
organic chemistry - A sample of 2-butanol has a specific rotation of -9.75 ...
Chemistry - A sample of 2-methyl-1-butanol has a specific rotation of -3.25°...
Math - Can anyone please rephrase this. I really can't understand this term...
OChem - If the limonene reactant described in question 2 is composed of a single...
For Further Reading
