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Consider a 0.80M solution of HCN. The Ka of HCN is 6.2x10-10. What are the major species in solution? Calculate the pH of this solution.

  • Chemistry - ,

    ..........HCN ==> H^+ + CN^-
    initial...0.80M...0......0
    change.....-x......x.....x
    equil....0.80-x....x.....x

    Ka = (H^+)(CN^-)/(HCN)
    Substitute and solve for x and convert to pH.
    After you finish the calculation you will know what the major species are. Don't forget H2O as a major component.

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