thats bullshit, baking soda is heavier than coke and seperates out when you cut lines, crack, or freebase, is made by mixing cocain, baking soda and water and heating it up, the baking soda frees the base from the acid form, making it smokable much the same way as meth, only much more harsh, and it crackles when it burns, hence the name, crack. it only takes about half a hit to be more blown than a gram of coke through the nose, but the comedown is soooo unbearable that you will be almost forced to take another hit, and another, becuase your tolerance doubles every time you do it. and crack is in rock form, wont mix with powders like baking soda without being painfully obvious.
you got a lucky break, a 20 rock is about the size of a pencil erasor, a little smaller, though you really don't want to try that, the second you hit a ghetto with some rock you will get jumped or shot, those guys will do anything for it, and will know that you are out of your element. I knew a crack dealer once, they used to mess with the rock heads, make them do all kinds of sick degrading things for rock, ask yourself this, if a woman is willing to have sex with a dealers rottwieller for a 10 rock, what would she do if she knew you had a grands worth???? your best bet is to find a dealer and give it too him for dirt cheep, hopefully he will be so happy he wont just have his customers jump you and take it.