Baking Soda: baking soda [chemical]. Sodium bicarbonate is a crystalline solid compound of white, soluble in water, with a slight alkaline taste resembling of the sodium carbonate, formula Nahco3 = Sodium hydrogen carbonate - molar mass: 84. 007 g/mol - Formula: NaHCO3 and has a density of 2. 2 g/cm³, commonly called in South America "cow soda", in allusion to the title of its manufacturer, labeled in a box bound for home use.