1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Help calculating charge of Cl- and K+ ions

  1. Jun 3, 2006 #1
    Sorry if this is a ridiculously simple problem, but I don't get it. The professor didn't give examples of how to do this and it's been years since I've taken science courses. I have to determine the electric force (Coulomb's Law) on the K+ ion due to the Cl- ion 9E-10m away. How do you determine the charge of the K+ and Cl- ions? K(19) has atomic mass 39.0983 and Cl(17) has atomic mass 35.4527... but I don't know where to start with calculations. Please help? Thank you.
     
  2. jcsd
  3. Jun 3, 2006 #2

    Hootenanny

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    K+ indicates a charge of +1e; Cl- indicates a charge of -1e, where e is the charge of an electron in coulombs. Therefore, the charge on the K+ in coulombs is 1 [itex]\times[/itex] (1.6x10-19). Do you follow?

    ~H
     
  4. Jun 3, 2006 #3
    O.

    I guess I was making it harder than it needed to be. Sorry, that was stupid now. Thank you : )
     
  5. Jun 3, 2006 #4

    Hootenanny

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    No problem :smile:

    ~H
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Help calculating charge of Cl- and K+ ions
  1. Calculate charge (Replies: 4)

Loading...