help!!!!電解nacl

Sodium would not normally be made in the laboratory as it is so readily available commercially. All syntheses require an electrolytic step as it is so difficult to add an electron to the poorly electronegative sodium ion Na+.

Sodium is present as salt (sodium chloride, NaCl) in huge quantities in underground deposits (salt mines) and seawater and other natural waters. It is easily recovered as a solid by drying.

Sodium chloride has a high melting point (> 800°C) meaning that it sould be expensive to melt it in order to carry out the electrolysis. However a mixture of NaCl (40%) and calcium chloride, CaCl2 (60%) melts at about 580°C and so much less energy and so expense is required for the electrolysis.

cathode: Na+(l) + e- → Na (l)

anode: Cl-(l) → 1/2Cl2 (g) + e-

The electrolysis is carried out as a melt in a "Downs cell". In practice, the electrolysis process produces calcium metal as well but this is solidified in a collection pipe and returned back to the melt.

Displacement with potassium would also seperate sodium from chloride ion, but as soon as it seperate, it reacts with water to form NaOH.

NaCl+CaCl(酒精燈)=熔融得出Na.Ca.Cl2

2007-02-20 10:17:22 補充：
H CL=HCL常温常压..!

1)電解熔融既nacl咪得~
2)amp;gt;係唔係一d 電腦不能識別既符號?
樓上話果個係atm.......

2007-02-20 08:45:24 補充：
H2(g) Cl2(g)--->2HCl(g)難道=H2(g) Cl2(g)--- 2HCl(g)

2007-02-20 08:46:46 補充：
我都打唔到......係箭咀---〉

q1)用K + NaCl置換出Na

q2)amp好似係解大氣壓,gt....係咪指溫度係室溫/高溫

兩題都唔太肯定