Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Concentration of ions in a reaction

  1. May 9, 2010 #1
    Alright guys, I am a little bit confused on how to find the concentration of ions in a reaction. In a solution, it is relatively easy.

    Are the number of ions in the beginning the same they are in the end?

    Please give me some general guidelines: i know to begin with a balanced equation , then a net ioc equation...but how does the net ionic equation help me??

    Thank you so much, I will further update this question...so I can't specifically put my questions into words!

    Any help appreciated, thank you so much.
  2. jcsd
  3. May 10, 2010 #2


    User Avatar
    Gold Member

    What do you mean by "the concentration of ions in a reaction"? Do you mean that you need to find the concentration of a solution after a reaction?

    Not necessarily. Ions may be involved in many reactions where gases, precipitates, other ions etc. are formed, so the number of ions after a reaction will not generally be the same as before the reaction.

    Could you provide a specific example of what you are trying to do?
  4. May 10, 2010 #3


    User Avatar

    Staff: Mentor

    I believe this is a dangerous wording (even if correct), as it may be read by someone that mass conservation is violated. And knowing students if something can be understood incorrectly, it will be.

    Heck, even if something is worded in a way that can't be understood incorrectly, it will, against all odds.

    Number of ions can change, but those that have "disappeared" are still there, just in different form. Number of atoms of an element (in all oxidation states) have not changed.
  5. May 12, 2010 #4
    Ok...thanks for the help anyway. I think I got it, thank you everyone.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook