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Old Nov 23rd 2008, 11:21 PM   #1
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Unit of charge

I have a question

A coulomb is made up of either 6.25 x 1018 electrons or 6.25 x 1018 protons or charged ions carrying a charge of +1 or -1.

The question posed - In a solution of Mg+2 ions how many of these ions must flow to a negative point in the solution in order for a coulomb of charge to have flowed to that point?

The answer is 3.125 x 1018 Mg2+ ions.

Im not sure how the answer is arrived at?

Cheers Petra
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Old Dec 4th 2008, 06:53 AM   #2
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Here Mg+2 ion carries 2 units of +ve charge.Hence 1/2 of total charge is sufficient to produce same current.Similarly if you have +or-3 on an ion 1/3 of total carriers is sufficient.
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