bicarbonate vs hydrogen carbonate

bicarbonate

noun
  • sodium bicarbonate used as a mild antacid; bicarbonate of soda 

  • the univalent anion HCO₃⁻; any salt of carbonic acid in which only one of the hydrogen atoms has been replaced. 

hydrogen carbonate

noun
  • Synonym of bicarbonate 

  • carbonic acid 

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