sodium vs sodium bicarbonate

sodium

noun
  • Employing 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. 

sodium bicarbonate

noun
  • A salt of sodium hydroxide and carbonic acid, NaHCO₃. 

  • This salt used in cooking as a raising agent, as an antacid, a cleaner, etc. 

How often have the words sodium and sodium bicarbonate occurred in a corpus of books? (source: Google Ngram Viewer )