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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