acid and base

An ionic compound is dissolved with an appropriate solvent, or otherwise melted by heat, so that its ions are available in the liquid. An electrical current is applied between a pair of inert electrodes immersed in the liquid. The negatively charged electrode is called the cathode, and the positively charged one the anode. Each electrode attracts ions which are of the opposite charge. Therefore, positively charged ions (called cations) move towards the cathode, while negatively charged ions (termed anions) move toward the anode. The energy required to separate the ions, and cause them to gather at the respective electrodes, is provided by an electrical power supply. At the probes, electrons are absorbed or released by the ions, forming a collection of the desired element or compound.

NH4 means this compound contains one nitrogen ion and 4 hydrogen ions.
NH3 means this compound contains one nitrogen ion and 3 hydrogen ions.

i am sorry, i only knows the words in english, do you know their english name?
is that something about acidic and cation?

^(oo)^
I don't know.