| physical chemistry numerical |
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conman1987
Probably a bot.
Joined: 08 Mar 2005
Posts: 1
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 Posted: Tue Mar 08, 2005 8:30 am Post subject: physical chemistry numerical |
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I need help with this question:
Q: Calculate the current required to deposit all the silver from silver nitrate solution containing 8.5g of silver nitrate in 60 minutes.
Thank you,
-pH.
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charco
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Joined: 07 Mar 2005
Posts: 96
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| Posted: Tue Mar 08, 2005 8:54 am Post subject: |
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calculate the number of moles of silver present
moles = mass of silver nitrate/RMM silver nitrate
moles = 8.5/170 = 0.005 moles
Each silver ion has a 1+ charge therefore 0.005 moles silver requires 0.005 moles of electrons
1 mole of electrons = 98,500 coulombs of charge
Therefore 0.005 moles = 4925 coulombs
Charge = current(amps) x time (seconds)
4925 = current x 60 x 60
Current = 4925/3600
Hence current required = 1.368 amps
Last edited by charco on Tue Mar 08, 2005 8:55 am; edited 1 time in total |
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