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ok i need to say WHY and use proper names and everything...

umm...so i used lemon juice in 2 cups and used a spoon in one and aluminum foil in the other and used aligater clips and wire to connect them.

my salt bridge was a paper towl.

i should explain why i used all these things...i really don't get it :( :(

and it's due tomorrow and i want to go to college, so please help me as much as you can.

you don't need to WRITE it for me, just tell me what to write!!!

and I'll love you forever and ever and ever!!!

THANK YOU!!!

2007-04-15 13:42:46 · 4 answers · asked by Anonymous in Science & Mathematics Chemistry

4 answers

Ok, you really owe me for this one.

What you need for a battery to work is

A) a substance that gives electrodes (oxidizes)
B) a substance that receives electrodes (reduces)
C) a place in which this reaction happens (the electrodes), note that the electrodes themselves can participate in the reaction.
D) something that keeps electrical balance. There must be an equal number of positive and negative charges inside a solution, so if a substance looses an electron, something negative must come into solution to compensate this (this is the salt bridge).

Why you used the things you used.

Aluminium foil - The aluminium metal has a very strong tendency to oxidize, it gives up electrons.

Spoon - The spoon does not oxidize readily because the oxidation of stainless steel, or iron is less spontaneous than that of aluminium, instead it provides the surface in which the reduction happens. The specie that really reduces is the hydronium ion (H3O+, commonly expressed as H+), which is in solution as you added it with the lemon juice). You may have observed bubbles of hydrogen gas evolving from this electrode.

Lemon juice - It provides many things, being the most important the specie that reduces, Hydronium ion.

Paperl towel - the salt bridge mantains electrical neutrality. when some aluminium oxidizes to Al3+ some negative ions on the tower enter the solution on that cup and when some H+ ions reduce to H2 some positive ions enter the solution on that cup.

I just hope you learned a lot !! :) and your welcome.

2007-04-15 14:05:02 · answer #1 · answered by Daniel F 2 · 0 0

The lemon juice was an electrolyte, citric acid solution. You used two dissimilar metals, stainless steel and aluminum as the electrodes. The salt bridge was a continuous connection of an electrolyte (probably salt, NaCl, in water, soaking the paper towel to conduct current by movement of ions). The aluminum was oxidized, sending electrons to the external circuit through the alligator clip and wire. Aluminum ions went from the foil into the one lemon juice solution. Hydrogen ion from the second lemon juice solution was reduced to hydrogen gas, which bubbled from the spoon. Electrons from the external cirecuit flowed from the wire through the alligator clip to the spoon. Because oxidation occurred at the aluminum foil, that is the anode. By default, the spoon is the cathode. In the paper towel, sodium and chloride ions migrated to the one or other electrode until they got tired out.

2007-04-15 20:55:26 · answer #2 · answered by steve_geo1 7 · 0 0

wow

2007-04-15 20:44:56 · answer #3 · answered by Ask Shirley 3 · 1 0

nah, i dont do little girls homework!

2007-04-15 20:46:08 · answer #4 · answered by . 6 · 0 0

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