How many coulombs are required to discharge 1 mole of the following ions: Cu^2+, Na^+, Pb^2+. (1 mole of electrons = 96500 coulombs)

Expert Answers

An illustration of the letter 'A' in a speech bubbles

To solve this type of problem, first write the half-reaction that is taking place. Then look at the number of moles of electrons involved and then convert that to coulombs.

In the first case:

Cu =  Cu^+2 + 2 e^-1  This means that two moles of electrons are produced when copper is oxidized to copper +2.  Two moles of electrons is equal to 2 moles * 96500 Coulombs/mole = 193,000 C.

Na = Na^+1 + 1 e^-1  One mole of electrons is produced which is equal to 96,500 C

Pb = Pb ^+2  + 2 e^-1   Two moles of electrons, or 193,000 C

See eNotes Ad-Free

Start your 48-hour free trial to get access to more than 30,000 additional guides and more than 350,000 Homework Help questions answered by our experts.

Get 48 Hours Free Access
Approved by eNotes Editorial Team