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    Buffer Preparation with NH3 and NH4Cl

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    Calculate the pH for a buffer solution prepared by mixing 100. mL of 0.60 M NH3 and 200. mL of 0.45 M NH4Cl.

    The Ka of NH4 + = 5.6 x 10^-10.

    a) 8.65
    b) 9.08
    c) 9.87
    d) 4.90
    e) 6.62

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    Solution Preview

    We will use the famous Henderson-Hasselbalsch (H-H) equation to solve this problem. Remember, we can always use this equation when we have a simple proton donor/proton acceptor system. In this case, the proton donor is NH4Cl and the proton acceptor is NH3.

    pH = pKa + log [A-]/[HA]

    Since we know that the Ka of NH4+ is 5.6 x 10^-10, all we ...

    Solution Summary

    I provide a very simple to understand step by step walk-through on how to solve this problem using the Henderson-Hasselbalsch equation.