The Same as Baking Soda: __ Bicarbonate
Puzzle 2 of Day of the Dead Hard Pack
Question is: The Same as Baking Soda: __ Bicarbonate
and the answer is: SODIUM
Word Meaning:
SODIUM — The chemical element (symbol Na) with an atomic number of 11 and atomic weight of 22.990. It is a soft, waxy, silvery, reactive alkali metal that is never found unbound in nature.
Definitions from Wiktionary.