An Investigation into the effect of concentration of an electrolyte upon the amount of energy that is able to pass through it.
Aim: To prove that the concentration of an electrolyte affects the current that can be passed through it
Materials: Hydrochloric acid (HCl),
Prediction: I believe that as the concentration increases, so does the amount of current passed through the electrolyte. I believe that the graph that I will get from the experiment will be this. I believe this as the experiment is reliant upon the surface area of the electrode at any one given time. I therefore believe that, there will be a peak to the graph as the surface area of the electrodes slowly reduces because of the numbers of ions 'swarming' towards it.
All ionic compounds can be decomposed by using electricity by a process called electrolysis.
But, for all to decompose, they have to be in a molten state. During the decomposition, the compound breaks to form ions. These ions are then attracted to either the cathode ( the negative electrode) or the anode (the positive electrode) depending on their charges. Metals and Hydrogen always form positive ions, and the non-metal will always form a negative ion. The electrodes are made of an inert material such as graphite, (unless purifying or electroplating a metal), this is so that they remain there throughout the experiment. The molten substance that is electrolysed is called the electrolyte.
Hydrochloric Acid hydrogen gas and chlorine gas
2HCl(L) H2 + Cl2
At the cathode:
2H+ + 2e- H2
At the anode:
The electrolysis of solutions
If a salt is dissolved in water (aqueous), the ions are free to move, and so the...