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Posted by on Tuesday, February 28, 2012 at 4:36pm.

Determine the Concentration of OH^-1 and pH of a solution that is 0.140 M F^-1.

I did F- +H20 ---> HF + H20

but idk what to solve from there....

  • Chemistry - , Tuesday, February 28, 2012 at 6:18pm

    prepare an ICE chart and write the kb equation for F^-
    .............Fe^- + HOH == HF + OH^-
    initial....0.140...........0......0
    change......-x.............x.......x
    equil.....0.140-x..........x.......x

    Kb for F^- = (Kw/Ka for HF) = (HF)(OH^-)/(HF)
    Substitute values from the ICE chart for (HF), (OH^-), and F^-, and for Kw and Ka, solve for x (which is OH^-), convert that to pOH, then to pH.

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