Baking soda is one of the items widely used to turn cocaine into crack. Rappers often make subtle references to items popular in making crack cocaine such as baking soda and pyrex glass in their rap songs.
In OT Genasis' "Coco" song, he raps, "I'm in love with the coco - I got it for the low, low" and "Bakin' soda, I got bakin' soda - Whip it through the glass, n*gga." Those lines are referencing the making of crack cocaine. Genasis is in love with Coco (Cocaine) and he has baking soda which he will later use to cook the cocaine in a glass utensil to turn it into crack.