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-   -   Ksp values and Solutions (https://www.askmehelpdesk.com/showthread.php?t=436552)

  • Jan 18, 2010, 05:35 PM
    phys_08
    Ksp values and Solutions
    which one of the following solutions will contain the greatest strontium ion concentration: strontium carbonate solution (Ksp=5.6*106-10) or strontium fluoride solution (Ksp= 4.3*106-9)
  • Jan 21, 2010, 07:05 AM
    Unknown008

    Write down the equations:





    Write down the formula for each reaction and equate it to the corresponding Ksp value.

    Post what you did! :)
  • Jan 21, 2010, 11:15 PM
    phys_08

    SrCO3(s) goes to equilibrium then Sr+2+ CO3-2
    Ksp= conc of Sr+2 multiply by conc of CO3-25.6 *10^-5=X^2 then that equals to 2.5*10^-5=x

    then For the second equation you do the same thing except different values of Ksp

    Ksp=conc of Sr+2 multiplied by F-2 ^2
    then, 4.3*10^-3=4X^3
    equals to 1.0*10^-3=X

    so the final answer is SrF2 has more concentration Sr+2 concentrations.
  • Jan 22, 2010, 09:37 AM
    Unknown008

    Well, while your final answer is good, I can't see where you got the numbers:
    25.6*10^-5

    I got

    Check your calculation well.
  • Jan 22, 2010, 04:39 PM
    phys_08

    I made a mistake sorry, its suppose to be CO3-2 5.6 *10^-5=X^2 I forgot to be put space between Co3-2 so the final answer is 2.5*10 ^-5.
  • Jan 22, 2010, 10:42 PM
    Unknown008

    Oh, now I see it. The numbers just got messed up.

    It's good, you got the correct answer :)

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