Slides in this set
Ionic substances contain charged particles called ions. For example,
lead bromide contains positively charged lead ions and negatively
charged bromide ions.
Electrolysis is the process by which ionic substances are
decomposed into simpler substances when an electric current is
passed through them.
The substance that is broken down is called the electrolyte.…read more
How Electrolysis Works
For electrolysis to work, the ions must be free to move. Ions are
free to move when an ionic substance is dissolved in water or when
Positively charged ions move to the negative electrode during
electrolysis. They receive electrons and are reduced.
Negatively charged ions move to the positive electrode during
electrolysis. They lose electrons and are oxidised.…read more
The negative electrode should be the object that is to be
The positive electrode should be the metal that you want to coat
the object with
The electrolyte should be a solution of the coating metal, such as
its metal nitrate or sulphate…read more
The object to be plated, is connected to the negative terminal of the
power supply. A piece of copper is connected to the positive
terminal. The electrolyte is copper sulphate solution.
This arrangement can also be used to purify copper during copper
manufacture. In this case, both electrodes are made from copper.
The negative electrode gradually gets coated with pure copper as
the positive electrode gradually disappears. The animation shows
how this works…read more