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a person asked in Science & MathematicsChemistry · 1 decade ago

A buffer is prepared containing 0.25M NH3 and 0.45M NH4+. Calculate the pH of the buffer using the Kb for NH3.?

Can someone show me how to solve this problem please?

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  • Glenguin
    Lv 7
    1 decade ago
    Favorite Answer

    The Henderson-Hasselbalch equation is:

    pH = pKa + log(A/AH)

    In this case A = NH3 and AH = NH4+. The pKb of NH3 is 4.75. Substituting,

    pH = (14-4.75) + log(0.25 / 0.45) = 9.00.

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