Chemistry

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Calculate the pH of a solution created by adding 5.00g of LiF to 150.0mL of 1.25M HF. Ka = 7.2 x 10-4

  • Chemistry -

    (LiF) = grams/molar mass = 5/about 26 = about 0.2M but you should do it more accurately.

    .......HF ==> H^+ F^-
    I......1.25...0...0.2M
    C......-x.....x....x
    E.....1.25-x..x...0.2+x

    Ka HF = (H^+)(F^-)/(HF)
    Substitute the E line and solve for x, then convert to pH.

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