daniel model (1 Viewer)

[s_t_a_r1234]

can some please explain the whole process, i kno the cu disintegrates into cu ions and something or rather and neutralisation ? im aware of electrons unable to flow thru a broken circuit.. and so could someone articulately explain

 

[sikeveo]

Daniel invented the cell (Daniel cell) that had the advantage of NOT using acid solutions. Acid solutions produce toxic gases.

Instead, he used salt solutions. Different metals have different tendencies to liberate electrons when in contact. The Daniel cell uses Zinc in its ions Zn²⁺ ( as ZnSO₄) conected with Copper in its ions Cu²⁺ ( as CuSO₄ ). Both solutions are separated by a porous medium, Externally, the metals are electrically bound. As the metal zinc has more tendency in loosing its electrons to copper, then Zinc will be corroded, like this :

Zn -> Zn²⁺ + 2e^-

These two electrons flow through the electric wire and reach the copper. There, the copper ions Cu²⁺ will be attracted and deposit as metal, like this:

Cu²⁺ + 2e^- -> Cu

The voltage in this case will be 1.10 Volt theoretically. It depends on temperature, agitation, salt concentration, but it will be near 1 Volt. I have a practical written up, if you really need it, I guess I can type it up.

 

[insert-username]

There is a very nice presentation located here: http://www.mhhe.com/physsci/chemistry/essentialchemistry/flash/galvan5.swf] on the Daniel Cell. You'll need Macromedia Flash to view the presentation.


I_F

 

[Riviet]

Neutralisation is NOT a redox reaction because there are no transfers of electrons between atoms. Also if you know about oxidation numbers, if the ON doesn't change then it's not a redox reaction, and in all neutralisation reactions the ON number is the same on both sides of equation.

 

[n a + a l i e]

?

neutralisation is a double displacement reaction right?