Upload
geraldine-hunter
View
226
Download
1
Tags:
Embed Size (px)
Citation preview
Content page
Introduction of Electrolysis
Properties of sea water
Compositions of sea water
Electrode
Electrolysis of sea water
Chlorine gas
Hydrogen gas
Sodium hydroxide solution
Conclusion
- A method of separating bonded elements and compounds by passing an electric current through them.
- The most common form of electrolysis is the
electrolysis of water
Electrolysis
Properties of sea water
Physical properties:
- Water density- Sound speed- Temperature [ the most important ]*- Salinity [a liquid mixture of salt and pure water ]- Chlorophyll concentration- Particulate level
Seawater is a mixture of various salts and water.
Electrode
-The negatively charged one is the cathode
-The positively charged one is the anode
- Each electrode attracts ions which are of the opposite charge
- At the probes, electrons are absorbed or released by the ions, forming a collection of the desired element or compound
electricitySea water chlorine gas + hydrogen gas + sodium hydroxide solution
-Pass electricity though the sea water
-Chlorine gas is formed at the anode ( positive electrode)
-Hydrogen gas is formed at the cathode (negative electrode)
- In the end, the solution in the set-up becomes sodium hydroxide solution (sodium hydroxide is a compound made up of sodium, hydrogen and oxygen)
The electrolysis of sea water
Chlorine Gas
- It is a greenish yellow gas- It is a respiratory irritant- It irritates the mucous membranes and the liquid burns the skin - It was used as a war gas in 1915- a powerful oxidizing, bleaching, and disinfecting agent
Hydrogen gas
- It is a colourless and odourless gas
- Since hydrogen is 14.5 times lighter than air, it was once widely used as a lifting agent in balloons and airships
- It is an ingredient in rocket fuels
Sodium hydroxide solution (NaOH)
- It is known also as lye or caustic soda
- It is a caustic metallic base used in industry, mainly used in the manufacture of paper, textiles and detergents
Glossary
anode: A positively charged electrode.cathode: A negatively charged electrode.compound: A pure substance composed of more than one element.covalent bond: A chemical bond that involves sharing of electron pairs.electrode: A solid electric conductor through which an electric current enters or leaves an electrolytic cell.electron: A negatively charged subatomic particle with a mass of 0.00055 atomic mass units (AMU). By definition, one AMU is one-twelfth the mass of a carbon-12 atom.ion: A charged particle.ionic bond: An electrostatic interaction between a cation (+ charged ion) and an anion (- charged ion).
Sources
www.yahoo.com
www.google.com
http://en.wikipedia.org/wiki/Electrolysis
http://www.cinms.nos.noaa.gov/pcw2/pcwprop.html
http://www.bigelow.org/aquarius/electrolysis.html
http://wikipedia.org/wiki/chlorine
http://wikipedia.org/wiki/hydrogen
http://en.wikipedia.org/wiki/Sodium_hydroxide