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chemistry... HELPP

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Pyridine is a weak base that is used in the manufacture of pesticides and plastic resins. It is also a component of cigarette smoke. Pyridine ionizes in water as follows:

C5H5N + H2O<-->C5H5NH+ + OH-

The pKb of pyridine is 8.75. What is the pH of a 0.190 M solution of pyridine?

  • chemistry... HELPP - ,

    pKb = -log Kb
    -8.75 = log Kb
    Solve for Kb.

    ........BN + H2O ==> BNH^+ + OH^-
    I......0.190..........0.......0
    C.......-x............x........x
    E......0.190-x........x........x

    Substitute the E line into the Kb expression and solve for x = OH^-, then convert to pH.

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