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    ccsharp63's Avatar
    ccsharp63 Posts: 1, Reputation: 1
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    #1

    Oct 3, 2012, 12:45 PM
    Physics question help, please!
    Two electrodes are placed in a calcium chloride solution and a potential difference is maintained between them. If 5.7 1016 Ca2+ ions and 6.5 1016 Cl‾ ions per second move in opposite directions through an imaginary area between the electrodes, what is the current in the solution?
    Abhimanyu Pudi's Avatar
    Abhimanyu Pudi Posts: 77, Reputation: 4
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    #2

    Oct 3, 2012, 10:48 PM
    What are " 5.7 1016" and "6.5 1016"? We need moles or any related units to solve this but I am unable to find such.
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #3

    Oct 4, 2012, 12:36 AM
    To get the current, you need to use the formula:



    Q is the charge flowing. You have 5.7x10^16 doubly positively charged ions, and 6.5x10^16 singly negatively charged ions. Find the net charge flow per second and substitute it into the formula. It's pretty straight forward.
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