Properly made crack
isn't done by mixing baking soda and cocaine and heating till the water evaporates.
The correct way is to gently heat the cocaine in a spoon with baking soda and water, at which point you'll see oily spots on the top of water. The oily spots are what you want:
With a metal tool, you start scraping these oily spots to the side of the spoon (and out of the water). As you drag these to the side, they start clumping together and will dry pretty quickly as a hard lump. Continue doing that until you get all the oil spots out.
Just mixing the baking soda and cocaine in water and boiling the shit out of it until the water is gone isn't a good way to do it (although i know some people do that). It will probably still work but it won't smoke nearly as well or hit nearly as hard.
But watch out. Crack is incredibly addictive, its almost like an entirely different drug when compared to cocaine.