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October 24, 2025, 03:08:19 am
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Author Topic: lead acid accumulator  (Read 1023 times)  Share 

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monokekie

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lead acid accumulator
« on: November 11, 2009, 12:47:10 pm »
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in the lead acid accumulator, which ions in the electrolyte of the batery would haave a net migrant towards the positive electrode??

 :) thanks for your help
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well the limit can turn into a threshold..

Mao

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Re: lead acid accumulator
« Reply #1 on: November 11, 2009, 12:52:27 pm »
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Discharge:

Anode (negative) -
Cathode (positive) -

You can see here that sulfate ions migrate to both electrodes (no net migration), while H+ only migrate towards the positive electrode.
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monokekie

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Re: lead acid accumulator
« Reply #2 on: November 11, 2009, 01:02:13 pm »
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xie xie la, this is a question from stav09 question 6 C, the answer says it is negatively charged sulfate.

mmm. so i think the answer is wrong..
« Last Edit: November 11, 2009, 01:05:34 pm by monokekie »
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Dark Horse

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Re: lead acid accumulator
« Reply #3 on: November 11, 2009, 01:13:01 pm »
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Does the net migration occur because they are reactants at these electrodes, or is it to balance charge out like a salt bridge (anions to anode, cations to cathode?)
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Jarzoon

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Re: lead acid accumulator
« Reply #4 on: November 11, 2009, 02:52:51 pm »
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Quote from: monokekie on November 11, 2009, 01:02:13 pm
xie xie la, this is a question from stav09 question 6 C, the answer says it is negatively charged sulfate.

mmm. so i think the answer is wrong..

Yeah it is wrong. Should be H+
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Mao

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Re: lead acid accumulator
« Reply #5 on: November 11, 2009, 04:21:19 pm »
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Quote from: Dark Horse on November 11, 2009, 01:13:01 pm
Does the net migration occur because they are reactants at these electrodes, or is it to balance charge out like a salt bridge (anions to anode, cations to cathode?)

Because they are reactants, they are being consumed at one end.
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silva

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Re: lead acid accumulator
« Reply #6 on: November 11, 2009, 04:25:19 pm »
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no the answer is correct i discussed this with my teahcer today, cathode has a positive charge hence the negativer sulfate ions migrate to it,
the H2SO4 isnt a salt bridge, so the whole anions to the anode, cations to the cathode doesnt apply, because it is the elecrolyte
the SO4 ion have a NET  migration to the postive electrode...this still means they are found at anode and can participate in that reaction
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monokekie

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Re: lead acid accumulator
« Reply #7 on: November 11, 2009, 05:33:57 pm »
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Quote from: silva on November 11, 2009, 04:25:19 pm
no the answer is correct i discussed this with my teahcer today, cathode has a positive charge hence the negativer sulfate ions migrate to it,
the H2SO4 isnt a salt bridge, so the whole anions to the anode, cations to the cathode doesnt apply, because it is the elecrolyte
the SO4 ion have a NET  migration to the postive electrode...this still means they are found at anode and can participate in that reaction

um okay.. thanks! but i don't see why is H+ incorrect?
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well the limit can turn into a threshold..
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