Remember that most chemical reactions are conditioned by the pH of the medium in which the reaction takes place. Also, the majority of chemical reactions, enzymes, proteins in the body can not take place in conditions of very precise acidity necessary to maintain homeostasis.
I – Recalls:
An atom consists of a nucleus made of protons and neutrons, around which one or more electrons distributed in layers, themselves divisible into even smaller particles. Protons have a positive charge, neutrons are electrically neutral. The electrons themselves have an electrical charge opposite to that of the proton. Thus, an atom has a neutral electrical charge, with the same number of protons and electrons. The iron atom has 26 each, mercury, 80, while hydrogen, 1. The sub-components are identical, it is their number that gives them special properties. Most chemists of you will remember the periodic table of elements of DI Mendeleev.
Some elements have the ability to lose or gain electrons easily, and to relate their electrons of the outer layer. This gives respectively molecules and ions. These are the latest interest here, especially the ions from the hydrogen atom.
The first element is specificity of losing its single electron easily. Do not remain then only the positively charged proton, is denoted H +. It is the concentration of H + in a fluid which determines its acidity. (more…)