Need A2 chemistry help !

[eliza345]

Can someone please explain to me the difference between steam distillation and distillation under reduced pressure... when do we know which distillation to use when synthesizing different organic compounds?

 

[penelope365]

http://yougems.reflectionsinfos.com/queries/viewquery/515

 

[eliza345]

http://yougems.reflectionsinfos.com/queries/viewquery/515

This was really helpful. However, I still don't get the part where the substance to be separated in steam distillation has to be "steam volatile and immiscible in water"... I do not understand why this is a requirement.

 

[penelope365]

http://amrita.vlab.co.in/?sub=2&brch=191&sim=1547&cnt=1

 

[penelope365]

steam distillation is used in cases where for example you have raspberries (question in the past papers) and you want to obtain the oil of it to use in perfumes etc it has to be volatile so it can be obtained as a product and immiscible in water because you constantly supply the substance with water so you dont want it to react with that.

I hope I made sense ,thats how i learnt it

 

[eliza345]

Th

steam distillation is used in cases where for example you have raspberries (question in the past papers) and you want to obtain the oil of it to use in perfumes etc it has to be volatile so it can be obtained as a product and immiscible in water because you constantly supply the substance with water so you dont want it to react with that.

I hope I made sense ,thats how i learnt it

Thanks