Source: http://web.a9lame.com/Documents/Lyc%C3%A9e/Bac%20FR/a-Tronc%20commun%20International/a-Tronc%20commun%20Science/c-Chimie/a-Semestre%20I/b-Extraction,%20s%C3%A9paration%20et%20identification%20des%20esp%C3%A8ces%20chimiques/e-Corrections/Corrections%201%20Extraction,%20s%C3%A9paration%20et%20identification%20des%20esp%C3%A8ces%20chimiques.pdf