The elements of the copper-arsenic group are Hg2+, Pb2+, Bi3+, Cu2+, Cd2+, As3+, Sb3+ and Sn4+. They form sulphides that are insoluble in dilute HCl. It is not the case for sulphides of the following groups so we can isolate the ions from the copper-arsenic group from the ions of the other groups. Lead and […]
Posts from December 2017
Chapter 10: Qualitative laboratory analyses
In this chapter, we will discuss some procedures used to separate and identify ions/groups of interest in solutions composed of several molecules. We will describe one method for mineral compounds and one for organic compounds. I have no real doubt that nowadays mass spectrometers can probably do the job and with a quantitative result, but […]
Chapitre 1 : La réplication de l’ADN
Bien avant que la structure de l’ADN ne soit connue, les scientifiques se sont interrogés sur la capacité des organismes à créer des copies fidèles d’eux mêmes et, plus tard, sur la capacité des cellules à produire plusieurs copies identiques de macromolécules complexes. La spéculation à propos de ces problèmes était centrée sur le concept […]