The heat source you should use to heat flammable organic solvents is a sand bath.
What is a heat source?
A heat source can be defined as an object or system that is typically designed and developed to produce or radiate heat, which is then used to heat up a substance or organic solvent.
For flammable organic solvents, the most ideal or appropriate heat source to be used is a sand bath.
In conclusion, an electrically heated sand bath should be used as a heat source for flammable organic solvents such as acetone.
Read more on organic solvents here: https://brainly.com/question/7140629
