Question

How do you dry the organic dichloromethane layer? (To dry an organic solvent means to get rid of any water molecules that might be in the organic layer.)

How do you prevent uneven boiling or even bumping while heating the organic layer to remove dichloromethane?

Why do you have to work under the hood while removing dichloromethane on a hot plate? (2 points)

Answer 1

Water content Dichloromethane (wet solvent). wet Dichloromethane stored in Calcium hydride (drying agent) for overnight, then distill over calcium hydride before goin to use in reaction.

Sometimes uneven boiling or bumping while heating DCM, it makes bumping resulting expolsive, fire catching. To prevent this issue we need to use boiling chips or anti-bumping granule . which boils the dichloromethne(solvent) calmly during distillation process.

We have to work under the fumehood while removing dichloromethane on a hot plate. First off Dichloromethane boiling point is 36 oC , evaporates easily. If we use outside of the hood, our body inhealing this dichloromethne fumes. It is very danegerous to our health, causes cancer. So for prevent this issue we have to use in fumehood, fumehood sucks this fumes,send through exhauster. This lab practise very good for health and safety aspects.