Essay On Years B.C

Chemistry (history of Salt) Essay title: Chemistry (history of Salt) History of- “Evidence” shows sodium chloride was** important as long ago as when supposedly, mastodons were on the earth. Sodium chloride was being used before written history began. 2,700 years B.C there was published in China the Peng-Tzao-Kan-Mu, probably the earliest known pharmaceutical guide. (Sodium).