bicarbonate vs saleratus

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. 

saleratus

noun

  • sodium bicarbonate 

  • potassium bicarbonate 

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