normaly people would flame saying 'use search' yadda yadda
but seeing as how its 3a.. im bored and you want to get high.. ill help..
Crack
Mix 2 parts of coke HCL to 1 part baking soda in 20 ml of water. Heat solution gently until white precipitates form, and stop heating when precipitation stops. Filter and keep precipitate.
Wash precipitate once with water (this procedure usually omitted in street product).
Dry 24 hours under heat lamp. Voila. The product is much less pure (there is lots of baking soda left) but the procedure is safer.
Common Crack Method
Mix 2 parts of coke HCL (regular cocaine) to 1 part baking soda in 20 ml of water. Heat solution gently until white precipitates form, and stop heating when precipitation stops.
After gentle heating, the freebase coke will float to the top, any excess soda will precipitate to the bottom.
Given that, you'd never filter it, and the 24 hour heat lamp thing is unrealistic, too.
Just collect the compound that rises to the top, and you have the finished product.
Note that what you're trying to do is start and sustain a chemical reaction (bonding the hcl with the base-soda) so as long as the reaction is happening you don't have to continue heating.
there.. now say thanks